I have used thesaurus functionality in MS Word without any problem. But I hope the same functionality in a pdf reader or other format reader. What is your tool for dictionary and thesaurus?
closed as not constructive by Neil Fein♦ Mar 19 '12 at 18:09
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The English Language and Usage Stack Exchange web site has an answer to this question. Which thesaurus best describes the differences between several similar words?
Most of the answers posted under that question have links to good sites. (Note that the person who posted the question was a non-native English speaker.)
I personally like Macmillan Dicationary and Thesaurus. I don't know how "authorative" it is considered, but I usually seem to find the word that I'm looking for when I go there.
WordWeb is a one-click English thesaurus and dictionary program for Windows. It can be used to look up words from almost any program, showing definitions, synonyms and related words. It includes pronunciations and usage examples.
There is a free version, and also a paid version (WordWeb Pro). You can add Chambers Thesaurus to the latter as an option.
I have no affliation with the company, just a happy customer (for the last several years).