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.

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.