antonyms

English Synonyms and Antonyms
With Notes on the Correct Use of Prepositions

James Champlin Fernald

Döderlein's Hand-book of Latin Synonymes

Ludwig von Doederlein

A Dictionary of English Synonymes and Synonymous or Parallel Expressions
Designed as a Practical Guide to Aptness and Variety of Phraseology

Richard Soule

Putnam's Word Book
A Practical Aid in Expressing Ideas Through the Use of an Exact and Varied Vocabulary

Louis A. Flemming

Roget's Thesaurus of English Words and Phrases

Peter Mark Roget

The Century Vocabulary Builder

Joseph M. Bachelor

The Gutenberg Webster's Unabridged Dictionary: Section X, Y, and Z

Project Gutenberg

Moby Thesaurus List

Grady Ward