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Collins Dictionary Thesaurus

Comprehensive English thesaurus with 500,000+ synonyms and antonyms from HarperCollins

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    Collins Dictionary Thesaurus provides free online access to over 500,000 synonyms, antonyms, and definitions backed by Collins' 2.5 billion-word database. Available as a free website, freemium mobile apps, and as a commercial API for enterprise licensing through HarperCollins Publishers.

    Collins Dictionary Thesaurus provides free online access to over 500,000 synonyms, antonyms, and definitions backed by Collins' 2.5 billion-word database. Available as a free website, freemium mobile apps, and as a commercial API for enterprise licensing through HarperCollins Publishers.

    Visit Collins Dictionary Thesaurus

    Highlights

    • Over 500,000 synonyms and antonyms with definitions
    • Free online access via collinsdictionary.com
    • Available as mobile apps (iOS paid, Android freemium)
    • Enterprise API licensing available for commercial integration
    • Built on Collins' 2.5 billion-word database
    • Includes audio pronunciations and usage examples
    Data location
    Unknown
    Pricing
    Freemium
    EU-owned
    No
    Self-hostable
    No

    Good for

    • Content writers and editors refining word choice and phrasing in documents
    • Language learners and students studying English vocabulary and word relationships
    • Enterprises integrating dictionary/thesaurus APIs into educational or professional software platforms

    A European alternative to