The tag words has been heavily discouraged since the early days of the site. A few weeks ago I manually retagged every question that used words, and there are currently no questions with that tag, save one question that has since been migrated.
This tag is really bad. It means nothing at all, and is only ever used by utter n00bs who have no idea what other tags to put on a question. Everybody hates it. Please make it go away forever.
Edit And here it is almost a year later, and I just had to squash 5 "word" tags, 4 of which were the only tag on the question. Can we please get this added to a permanent blacklist-with-prejudice-attached? Pretty please? --Martha
5/31/2012 And once again, I had to kill something like 11 "words" tags, about half of which were the only tag on the question. Two of them were merged, so I can't even edit out the tag: What is the antonyms of "capitalize" and Asking question about position of a person in a list. I noticed that word is now listed as a synonym of words, but manifestly neither is blacklisted. Is there a reason the Powers That Be are refusing to do this?