The Dictionary of Management and Technology is more suited for upper grade assignments. English Dictionaries There are dozens of Webster's Dictionaries on the Internet. Sometimes it will come up with truly weird results, but try the Rhyming Dictionary . You definitely need a graphical browser for this site. Alan Cooper's Homonyms page.
Homonyms are words that sound alike, but that are spelled differently and have different meanings.
The Heteronym Homepage features words that are spelled identically but that have different meanings and are sometimes pronounced differently. Roget's Thesaurus with easy search forms and cross-reference links. Casey's Snow Day Reverse Dictionary lets you type in a definition and it will give you a list of possible words. If you see what looks like a good word, but aren't sure, you may click on it and jump to the full definition.