Nisus Software, Inc.
Nisus Thesaurus icon
Nisus Thesaurus
Free Thesaurus for macOS
Completely Free
No Ads, No Tracking
What is Nisus Thesaurus?
Nisus Thesaurus is a fast electronic thesaurus that works with any services-aware application including Safari, Apple Mail, TextEdit, and more. Nisus Thesaurus integrates seamlessly with Nisus Writer Pro and Nisus Writer Express.
Nisus Thesaurus screenshot
  • Completely free, without any ads or tracking.
  • Contains over 120,000 words.
  • WordNet based database.
  • Built-in glossary.

  • Use with any services enabled application.
  • Integrates seamlessly with Nisus Writer Pro.
  • Integrates seamlessly with Nisus Writer Express.
  • How to Use Thesaurus
    Using Thesaurus is easy. Just select the word in your favorite application and choose Nisus Thesaurus from the Services menu. When you select a word in Nisus Thesaurus, the synonyms for that word will be shown right next to it in the Word Browser. Go from "sky" to "cumulonimbus" in just a few clicks.

    Nisus Thesaurus knows the English language. Using the WordNet lexical reference database, Thesaurus knows over 120,000 words and how they relate to each other. When you lookup a word in Nisus Thesaurus, it will show you related words in six categories.