Here's another site that offers the differences between words. And there are tons of words here. There appears to be a lot of other stuff on the site as well.
Bartleby.com also has a nice section on misused words.
One word that bothers me is brilliant. On ESPN, they say that the infielder made a brilliant play at shortstop. I'd used "outstanding" or "superb" rather than "brilliant." Albert Einstein was brilliant, but he probably couldn't have fielded a grounder.
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