Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more.

Contains the vocabulary of English from the earliest written records to the present, with known recorded dates of usage, taken from the Oxford English Dictionary.

Allows direct term search with results hyperlinked to broader and narrower search terms. Available in English and Estonian.

Toolbox that allows you to search for rhymes and relationships between words and concepts.

A phrases thesaurus - give it a word and it will return a list of related phrases.

A resource for writers. Enter a single word and it will return a list of phrases and sayings that are related to the word in some way. In English.

Searchable online version of Roget's Thesaurus of English words and phrases.

An on-line lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept. Different relations link the synonym sets. From the Cognitive Science Laboratory, Princeton University

A dictionary and thesaurus in one. Also gives parts of speech and examples for more than 50,000 words.

Searchable online thesaurus from Merriam-Webster.

Contains over 260,000 synonyms and cross-references. Features succinct word definitions and hyperlinked category index.

Annotated directory.

Searchable WordNet and Roget's Thesaurus with meaning trees.

Provides direct term search followed by hierarchical and other types of browsing. Based on a UNESCO thesaurus.

An exploration of sense relationships within the English language. By clicking on words, you follow a thread of meaning, creating a spatial map of linguistic associations.

85,000 hyperlinked cross-references, plus proverbs and quotations from classic and modern authors.

E-text of Roget's Thesaurus No. Two, which is derived from the version of Roget's Thesaurus published in 1911.

A creative phrase tool for creative writers of any genre including college students, people just learning English, people wanting to improve their communication skills, artistic professionals and others.