A thesaurus allows you to find synonyms and antonyms of a specified word. MorphAdorner includes a simple thesaurus facility based upon the venerable WordNet project. WordNet groups English words into sets of synonyms called synsets. WordNet also offers brief definitions for words and provides semantic relations among the synonym sets. While WordNet provides many other facilities in addition to finding synonyms and antonyms, MorphAdorner currently exposes just a simple synonym and antonym search.

WordNet only contains nouns, verbs, adjectives and adverbs. It does not include prepositions, determiners, or other parts of speech.

You can try MorphAdorner's online thesaurus based upon WordNet synsets.