Nisus Thesaurus
Nisus Thesaurus is a free macOS thesaurus app that helps you find synonyms and related words from the Services menu in supported apps.
What is Nisus Thesaurus?
Nisus Thesaurus is a native macOS writing reference app for looking up synonyms and related words while you work in other apps. It is designed for writers, editors, students, and anyone who wants quicker word choice help without switching to a website. The app works with services-aware Mac applications such as Safari, Apple Mail, and TextEdit, and it also integrates with Nisus Writer Pro and Nisus Writer Express. Its word database is based on WordNet and includes over 120,000 words, along with a built-in glossary that helps distinguish different meanings of the same word. A simple browser-style interface lets you move through related terms and explore alternatives as you write. For Mac users who want a lightweight desktop thesaurus, Nisus Thesaurus focuses on fast vocabulary lookup and smooth system-level integration.
Key features
- Look up synonyms and related words for selected text from the macOS Services menu
- Use the thesaurus from services-aware apps such as Safari, Apple Mail, and TextEdit
- Browse word relationships across multiple categories
- Search a WordNet-based database with over 120,000 words
- View glossary information to distinguish different meanings of a word
- Work alongside Nisus Writer Pro and Nisus Writer Express for writing and editing
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Safety overview
Status: Safe
Nisus Thesaurus is a legitimate writing tool for macOS. Its access to selected text through the Services menu is normal for a thesaurus app, and removing it mainly affects thesaurus lookups and related writing workflows. Keep standard caution with any downloaded software by getting it from the publisher and installing updates when available.
Recommendation: Keep Nisus Thesaurus if you use it for writing, editing, or quick synonym lookups across Mac apps. If you no longer use its Services integration or prefer other language tools, you can remove it without affecting core macOS features.
Common paths
/Applications/Nisus Thesaurus.app
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