The best alternatives to Thesaurus Pro are FoxType, Power Theasaurus, and Simply Synonyms. If these 3 options don't work for you, we've listed a few more alternatives below.
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Power Thesaurus is a fast, convenient and comprehensive online thesaurus. Built by users for students and writers! The synonymic and other associations are suggested, rated and used by its visitors. Based upon regular visitor's participation and constant work of our editorial department for more than 10 years. Users enjoy easy-to-follow look & feel, yet with powerful assisting tools.
Simply Synonyms is a thesaurus extension for Google Chrome. It helps you easily find synonyms, antonyms and more without getting in your way. To use, simply double click any word on any page or access quick search and other features from the extension popup.
Search for the meaning of a variety of different words and in distinct languages. It has a collection of no less than 50 dictionaries, varying from the world-renowned Oxford Dictionary to the crowd-sourced Urban Dictionary, from English to Arabic.