Visual Thesaurus

This website allows you to look up synonyms and antonyms in a visual mind map.  On the right hand bar, you are able to identify the part of speech.  Below is a screen shot of a search for the word, "retrograde".  This site is great for understanding the usage of a new vocabulary word.  Not only can you look up words, you can also find the words that appear the most in a historical document or newspaper article, using the Vocab Grabber (a feature on the homepage of Visual Thesaurus).  Also, if your school subscribes to this website, students are able to save word searches and word lists.

http://www.visualthesaurus.com/