An API for the English Language.

Find definitions, related words, and more, with a simple to use RESTful API.

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Words API is Dictionary

Use it to find definitions for more than 150,000 words. Try some:

inevitable
ascendancy
boastful

A Thesaurus

You can find synonyms, antonyms, or similar words. Try some:

fast
warm
violet

And Much, Much More

Words API includes hierarchical information, such as knowing that:

a hatchback is a type of car
a finger is a part of a hand
oxygen is a substance of water

Try It

Enter a word to lookup and what you want the API to return.

Enter a Word

What to Get

Request URL

Response

Monthly Pricing Plans

Account billing and access are handled by RapidAPI.

Basic

Free

2,500 requests per Day

Pro

$10

25,000 Requests per Day

Ultra

$49

250,000 Requests per day

Mega

$89

500,000 Requests per day

Buy the Data - $629

If you'd prefer to host the data locally, you can purchase the Words API data set. Purchase of the Words API data set entitles you to use the data as much as you want, for as long as you want. Load the data directly into your app, make games with it, train an AI to take over the world with it.

The only things you cannot do with the data are resell it, or use it in a service that competes directly with WordsAPI. And we'd really prefer you didn't use it to train an AI to take over the world.

Sample Data

The sample file contains a random selection of 10% of the full Words API data set.

Download Sample

How it Works

Let us know about your interested by emailing us at [email protected]. We'll send you an invoice via Paypal. Once payment is received, you'll receive a link to download the full data set.

What You'll Get

The entire Words API data set in JSON format.

Over 325,000 words.
45% with one or more definitions.
56% with pronunciation information.
44% with syllable information.
18% with frequency of usage information.

Terms of Service

The following terms and conditions govern all use of the WordsAPI.com website and all content, services and products available at or through the website, including, but not limited to, the WordsAPI API (taken together, the Website). The Website is owned and operated by WordsAPI. The Website is offered subject to your acceptance without modification of all of the terms and conditions contained herein and all other operating rules, policies (including, without limitation, WordsAPI's Privacy Policy) and procedures that may be published from time to time on this Site by WordsAPI (collectively, the “Agreement”).

Please read this Agreement carefully before accessing or using the Website. By accessing or using any part of the web site, you agree to become bound by the terms and conditions of this agreement. If you do not agree to all the terms and conditions of this agreement, then you may not access the Website or use any services. If these terms and conditions are considered an offer by WordsAPI, acceptance is expressly limited to these terms. The Website is available only to individuals who are at least 13 years old.

Your WordsAPI.com Account. If you create an API account on the Website, you are responsible for maintaining the security of your account, and you are fully responsible for all activities that occur under the account and any other actions taken in connection with the account. You must immediately notify WordsAPI of any unauthorized uses of your account or any other breaches of security. WordsAPI will not be liable for any acts or omissions by You, including any damages of any kind incurred as a result of such acts or omissions.
Responsibility of Account Holders. If you use the API (any such material, “Content”), you are entirely responsible for the content of, and any harm resulting from, that Content. That is the case regardless of whether the Content in question constitutes text, graphics, an audio file, or computer software. By making Content available, you represent and warrant that:
- the downloading, copying and use of the Content will not infringe the proprietary rights, including but not limited to the copyright, patent, trademark or trade secret rights, of any third party;
- you have fully complied with any third-party licenses relating to the Content, and have done all things necessary to successfully pass through to end users any required terms;
- the Content is not getting advertised via unwanted electronic messages such as spam links on newsgroups, email lists, other blogs and web sites, and similar unsolicited promotional methods;
WordsAPI has the right (though not the obligation) to, in WordsAPI’s sole discretion (i) refuse or remove any content that, in WordsAPI’s reasonable opinion, violates any WordsAPI policy or is in any way harmful or objectionable, or (ii) terminate or deny access to and use of the Website to any individual or entity for any reason, in WordsAPI’s sole discretion. WordsAPI will have no obligation to provide a refund of any amounts previously paid.
Payment and Renewal.
- General Terms
  Paid API plans are available on the website. By selecting a paid plan you agree to pay WordsAPI the monthly or annual subscription fees indicated for that service. Payments will be charged on a pre-pay basis on the day you sign up for a paid plan and will cover the use of that service for a monthly or annual subscription period as indicated. Upgrade fees are not refundable.
- Automatic Renewal
  Unless you notify WordsAPI before the end of the applicable subscription period that you want to cancel a paid plan, your subscription will automatically renew and you authorize us to collect the then-applicable annual or monthly subscription fee for such paid plan (as well as any taxes) using any credit card or other payment mechanism we have on record for you. Paid plans can be canceled at any time in your dashboard.
Caching. You may cache and thus store API Data on your system for up to 24 hours, after which such cached API Data must be purged. Subject to that exception, you will not copy, store, archive, distribute to any third party (other than to End Users as contemplated in this Agreement) any API Data, any metadata or any Link. You agree that any cached API Data will be used by you only for the purpose of populating the Developer Application.
Copyright Infringement and DMCA Policy. As WordsAPI asks others to respect its intellectual property rights, it respects the intellectual property rights of others. If you believe that material located in a WordsAPI Content violates your copyright, you are encouraged to notify WordsAPI in accordance with WordsAPI’s Digital Millennium Copyright Act (“DMCA”) Policy. WordsAPI will respond to all such notices, including as required or appropriate by removing the infringing material or disabling all links to the infringing material. WordsAPI will terminate a visitor’s access to and use of the Website if, under appropriate circumstances, the visitor is determined to be a repeat infringer of the copyrights or other intellectual property rights of WordsAPI or others. In the case of such termination, WordsAPI will have no obligation to provide a refund of any amounts previously paid to WordsAPI.
Intellectual Property. This Agreement does not transfer from WordsAPI to you any WordsAPI or third party intellectual property, and all right, title and interest in and to such property will remain (as between the parties) solely with WordsAPI. WordsAPI, the WordsAPI.com logo, and all other trademarks, service marks, graphics and logos used in connection with WordsAPI.com, or the Website are trademarks or registered trademarks of WordsAPI or WordsAPI licensors. Other trademarks, service marks, graphics and logos used in connection with the Website may be the trademarks of other third parties. Your use of the Website grants you no right or license to reproduce or otherwise use any WordsAPI or third-party trademarks.
Changes. WordsAPI reserves the right, at its sole discretion, to modify or replace any part of this Agreement. It is your responsibility to check this Agreement periodically for changes. Your continued use of or access to the Website following the posting of any changes to this Agreement constitutes acceptance of those changes. WordsAPI may also, in the future, offer new services and/or features through the Website (including, the release of new tools and resources). Such new features and/or services shall be subject to the terms and conditions of this Agreement.
Termination. WordsAPI may terminate your access to all or any part of the Website at any time, with or without cause, with or without notice, effective immediately. If you wish to terminate this Agreement or your WordsAPI.com account (if you have one), you may simply discontinue using the Website. All provisions of this Agreement which by their nature should survive termination shall survive termination, including, without limitation, ownership provisions, warranty disclaimers, indemnity and limitations of liability.
Disclaimer of Warranties. The Website is provided “as is”. WordsAPI and its suppliers and licensors hereby disclaim all warranties of any kind, express or implied, including, without limitation, the warranties of merchantability, fitness for a particular purpose and non-infringement. Neither WordsAPI nor its suppliers and licensors, makes any warranty that the Website will be error free or that access thereto will be continuous or uninterrupted. You understand that you download from, or otherwise obtain content or services through, the Website at your own discretion and risk.
Limitation of Liability. In no event will WordsAPI, or its suppliers or licensors, be liable with respect to any subject matter of this agreement under any contract, negligence, strict liability or other legal or equitable theory for: (i) any special, incidental or consequential damages; (ii) the cost of procurement for substitute products or services; (iii) for interruption of use or loss or corruption of data; or (iv) for any amounts that exceed the fees paid by you to WordsAPI under this agreement during the twelve (12) month period prior to the cause of action. WordsAPI shall have no liability for any failure or delay due to matters beyond their reasonable control. The foregoing shall not apply to the extent prohibited by applicable law.
General Representation and Warranty. You represent and warrant that (i) your use of the Website will be in strict accordance with the WordsAPI Privacy Policy, with this Agreement and with all applicable laws and regulations (including without limitation any local laws or regulations in your country, state, city, or other governmental area, regarding online conduct and acceptable content, and including all applicable laws regarding the transmission of technical data exported from the United States or the country in which you reside) and (ii) your use of the Website will not infringe or misappropriate the intellectual property rights of any third party.
Indemnification. You agree to indemnify and hold harmless WordsAPI, its contractors, and its licensors, and their respective directors, officers, employees and agents from and against any and all claims and expenses, including attorneys’ fees, arising out of your use of the Website, including but not limited to your violation of this Agreement.
Miscellaneous. This Agreement constitutes the entire agreement between WordsAPI and you concerning the subject matter hereof, and they may only be modified by a written amendment signed by an authorized executive of WordsAPI, or by the posting by WordsAPI of a revised version. Except to the extent applicable law, if any, provides otherwise, this Agreement, any access to or use of the Website will be governed by the laws of the state of Virginia, U.S.A., excluding its conflict of law provisions, and the proper venue for any disputes arising out of or relating to any of the same will be the state and federal courts located in Virginia. Except for claims for injunctive or equitable relief or claims regarding intellectual property rights (which may be brought in any competent court without the posting of a bond), any dispute arising under this Agreement shall be finally settled in accordance with the Comprehensive Arbitration Rules of the Judicial Arbitration and Mediation Service, Inc. (“JAMS”) by three arbitrators appointed in accordance with such Rules. The arbitration shall take place in Virginia, in the English language and the arbitral decision may be enforced in any court. The prevailing party in any action or proceeding to enforce this Agreement shall be entitled to costs and attorneys’ fees. If any part of this Agreement is held invalid or unenforceable, that part will be construed to reflect the parties’ original intent, and the remaining portions will remain in full force and effect. A waiver by either party of any term or condition of this Agreement or any breach thereof, in any one instance, will not waive such term or condition or any subsequent breach thereof. You may assign your rights under this Agreement to any party that consents to, and agrees to be bound by, its terms and conditions; WordsAPI may assign its rights under this Agreement without condition. This Agreement will be binding upon and will inure to the benefit of the parties, their successors and permitted assigns.

Privacy Policy

Website Visitors

Like most website operators, WordsAPI collects non-personally-identifying information of the sort that web browsers and servers typically make available, such as the browser type, language preference, referring site, and the date and time of each visitor request. WordsAPI's purpose in collecting non-personally identifying information is to better understand how WordsAPI's visitors use its website. From time to time, WordsAPI may release non-personally-identifying information in the aggregate, e.g., by publishing a report on trends in the usage of its website.

WordsAPI also collects potentially personally-identifying information like Internet Protocol (IP) addresses for logged in users and for users accessing the WordsAPI API. WordsAPI only discloses logged in user and commenter IP addresses under the same circumstances that it uses and discloses personally-identifying information as described below.

Gathering of Personally-Identifying Information

Certain visitors to WordsAPI’s websites choose to interact with WordsAPI in ways that require WordsAPI to gather personally-identifying information. Visitors who sign up to use WordsAPI must provide an email address. Those who engage in transactions with WordsAPI – by subscribing to a paid plan – are asked to provide additional information, including as necessary the personal and financial information required to process those transactions. In each case, WordsAPI collects such information only insofar as is necessary or appropriate to fulfill the purpose of the visitor’s interaction with WordsAPI. WordsAPI does not disclose personally-identifying information other than as described below. And visitors can always refuse to supply personally-identifying information, with the caveat that it may prevent them from engaging in certain website-related activities.

Aggregated Statistics

WordsAPI may collect statistics about the behavior of visitors to its websites and API. For instance, WordsAPI may monitor usage patterns to different plan types in order to properly scale the service. WordsAPI may display this information publicly or provide it to others. However, WordsAPI does not disclose personally-identifying information other than as described below.

Protection of Certain Personally-Identifying Information

WordsAPI discloses potentially personally-identifying and personally-identifying information only to those of its employees, contractors and affiliated organizations that (i) need to know that information in order to process it on WordsAPI's behalf or to provide services available at WordsAPI’s websites, and (ii) that have agreed not to disclose it to others. Some of those employees, contractors and affiliated organizations may be located outside of your home country; by using WordsAPI’s websites, you consent to the transfer of such information to them. WordsAPI will not rent or sell potentially personally-identifying and personally-identifying information to anyone. Other than to its employees, contractors and affiliated organizations, as described above, WordsAPI discloses potentially personally-identifying and personally-identifying information only in response to a subpoena, court order or other governmental request, or when WordsAPI believes in good faith that disclosure is reasonably necessary to protect the property or rights of WordsAPI, third parties or the public at large. If you are a registered user of an WordsAPI website and have supplied your email address, WordsAPI may occasionally send you an email to tell you about new features, solicit your feedback, or just keep you up to date with what’s going on with WordsAPI. We primarily use our blog to communicate this type of information, so we expect to keep this type of email to a minimum. If you send us a request (for example via a support email or via one of our feedback mechanisms), we reserve the right to publish it in order to help us clarify or respond to your request or to help us support other users. WordsAPI takes all measures reasonably necessary to protect against the unauthorized access, use, alteration or destruction of potentially personally-identifying and personally-identifying information.

Cookies

A cookie is a string of information that a website stores on a visitor’s computer, and that the visitor’s browser provides to the website each time the visitor returns. WordsAPI uses cookies to help WordsAPI identify and track visitors, their usage of the WordsAPI website, and their website access preferences. WordsAPI visitors who do not wish to have cookies placed on their computers should set their browsers to refuse cookies before using WordsAPI’s websites, with the drawback that certain features of WordsAPI’s websites may not function properly without the aid of cookies.

Business Transfers

If WordsAPI, or substantially all of its assets, were acquired, or in the unlikely event that WordsAPI goes out of business or enters bankruptcy, user information would be one of the assets that is transferred or acquired by a third party. You acknowledge that such transfers may occur, and that any acquirer of WordsAPI may continue to use your personal information as set forth in this policy.

Privacy Policy Changes

Although most changes are likely to be minor, WordsAPI may change its Privacy Policy from time to time, and in WordsAPI’s sole discretion. WordsAPI encourages visitors to frequently check this page for any changes to its Privacy Policy. Your continued use of this site after any change in this Privacy Policy will constitute your acceptance of such change.