In the discussion under a recent post, a commenter named Scott Peterson pointed me to The Free Dictionary.com. Jason Peterson later let me know to be sure to include "the" in the URL. Thanks, guys. As a result, I visited for the first time this wonderful website, www.thefreedictionary.com. Check it out!
There's a great feature called Match Up, where you match five words with their synonyms, and then you find out how well you did. My first try I got five out of five. Oh, maybe that has something to do with why I love the website so much.