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Mathematical Thesaurus - [ Kids/Teens/Mature Teens ] - Defines mathematical words and concepts, and indicates the links between them.

Phrase Finder - [ Kids/Teens/Mature Teens ] - Enter a single word and it will return a list of phrases and sayings that are related to the word in some way.

Roget's II - The New Thesaurus - [ Teens/Mature Teens ] - Contains 35,000 synonyms, succinct word definitions and a hyperlinked category index.

Roget's International Thesaurus of English Words and Phrases - [ Teens/Mature Teens ] - 85,000 hyperlinked cross-references, plus proverbs and quotations from classic and modern authors.

Thesaurus.com - [ Kids/Teens/Mature Teens ] - Searchable online version of Roget's Thesaurus of English words and phrases.

Wordsmyth - [ Kids/Teens/Mature Teens ] - A dictionary and thesaurus in one. Also gives parts of speech and examples for more than 50,000 words.

WWWebster Thesaurus - [ Kids/Teens/Mature Teens ] - Searchable online thesaurus from Merriam-Webster.