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Wordnik API

The Wordnik API gives developers free access to extensive English dictionary data, including definitions, synonyms, antonyms, and example sentences, making it ideal for language learning and content creation.

Developed by Wordnik

Live API
99.95%Uptime
250msLatency
420Stars
API KeyAuth
NoCredit Card
RESTStyle
4.0Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Get multiple definitions for a word

Endpoint URL
https://api.wordnik.com/v4/word.json/{word}/definitions
Code Example
curl -X GET 'https://api.wordnik.com/v4/word.json/{word}/definitions' \
  -H 'Authorization: Bearer YOUR_API_KEY'
Request Payload
{
  "word": "serendipity",
  "limit": 5
}
Expected Response
{
  "text": "The occurrence of events by chance in a happy or beneficial way.",
  "partOfSpeech": "noun"
}
Version:v4
Limit:10000 requests/day

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://api.wordnik.com/v4/word.json/example"

Docs

Technical Documentation

What this API does

The Wordnik API provides comprehensive access to one of the largest English language word databases, delivering extensive lexical data such as definitions, synonyms, antonyms, example sentences, audio pronunciations, and etymologies. It allows developers to integrate rich language data directly into applications, websites, or educational tools.

How it works

This RESTful API facilitates easy integration using standard HTTP methods. Developers can query individual words, retrieve the word of the day, or explore related linguistic concepts. The API returns data primarily in JSON format, making it easy to handle in various programming languages and frameworks.

Authentication

The Wordnik API allows up to 1,000 requests per day without requiring a credit card or authentication. Developers can begin using the API immediately to access word data.

Example usage

  • /api/v4/word.json/{word}/definitions - Retrieves definitions for a specified word.
  • /api/v4/word.json/{word}/synonyms - Fetches synonyms for a given word.
  • /api/v4/word.json/{word}/antonyms - Returns antonyms for the requested word.
  • /api/v4/word.json/wordOfTheDay - Gets the word of the day with its details.
  • /api/v4/word.json/{word}/related - Explores related words and concepts.

Limits

Users can make up to 1,000 requests daily. There are no documented additional rate limits for standard usage.

Ideal use cases

  • Developing language learning applications that require vocabulary enhancements.
  • Creating content generation tools that leverage rich lexical data.
  • Integrating word data into games that involve vocabulary challenges.
  • Building educational tools that provide interactive language resources.

Examples

Real-World Applications

  • Language learning apps requiring word definitions and examples
  • Content management systems for enriching text with synonyms and antonyms
  • Educational software displaying daily vocabulary
  • Games leveraging word data for challenges and quizzes
  • Linguistic research tools analyzing word usage and etymology

Evaluation

Advantages & Limitations

Advantages
  • ✓ Extensive and rich lexical dataset with over 800,000 words
  • ✓ Multiple data types including audio and etymology
  • ✓ Free tier with generous daily request limit
  • ✓ Simple RESTful JSON API for easy integration
Limitations
  • ✗ Rate limit may restrict high-traffic commercial applications
  • ✗ API key required even for free tier
  • ✗ No official SDKs for all major languages, limiting immediate integration ease
  • ✗ Limited AI-powered or machine learning features within the API

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

4.0
Pricing Model
Tiered based on number of requests
Credit Card
Not Required
Response Formats
JSON
Supported Languages
6 Languages
SDK Support
REST Only
Rate Limit

1000 requests per day

Time to Hello World

Minutes

Free Tier

1000 free requests per day with no credit card required

Best For

Educational apps, content enrichment, language tools, word games

Not Ideal For

High-volume, low-latency enterprise applications

Tags

#wordnik#synonyms#definitions#free-api#words#dictionary#language#education

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