If you like to see connections between words, then try this visual dictionary called VisuWords. It will show the connections between words and identify the part of speech by color. By passing your cursor over one of the circles, a word box appears with more information.
This is another great resource from JimGatesTipline.
For a visual word thesaurus, try Visual Thesaurus. This site offers a home version- $39.95 or an online subscription for $19.99 per year.