best Thesaurus
Favorite aspect: After a group definition for like words, each word's individual sense is given; you don't just get a list of words.
Also, most words have example sentences, and many have antonyms. Look up words as in a dictionary, and of the word you're looking for is found in another group, it will direct you to the word you need to reference. Example: "INFLUENCE vb see AFFECT"
The short preface explains how to use the book and the abbreviations used.
