Two other words which are not used in English---at least
I have never seen them---are DESC ("Offspring: abbr.") and DUCTED ("Like many ventilation systems"). Puzzle creators often wind up with a combination of letters that is not easily changed, so they have to come up with an appropriate clue. I suppose "ducted" can be a legitimate word...but it sounds awkward.
Speaking of words: There are many circulars in today's newspaper. Sears is advertising "doorbusters." Kohl's is advertising "doorbusters." Macy's is advertising "doorbusters." Michaels is advertising "doorbusters." JC Penney is advertising "doorbusters." Kmart is advertising "doorbusters." Target is advertising "doorbusters." Toys Я Us is advertising "doorbusters." Big Lots is advertising "doorbusters." Jo-Ann Fabric & Crafts is advertising "doorbusters." Carter's Babies & Kids is advertising "doorbusters." Warehouse Discount Center is advertising "doorbusters." I don't know which advertiser was the first to call a sale a "doorbuster" but the word doesn't even mean anything...and it especially doesn't mean anything in 2014 when almost every chain store uses it. Every year, Lake Superior State University issues a list of overused words that should be banned. This year's list includes "selfie" and "twerk" and any word ending in "-ageddon" or "-pocalypse." It should have included "doorbuster." Maybe next year.
http://www.lssu.edu/banished/current.php