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User:Paul G, you mentioned in your note that you thought this might be a proper noun. and Merriam-Webster say it is an adjective, says it is a noun (the Scrabble officials happen to be quite intent on keeping proper nouns out of the Scrabble Dictionary).—This unsigned comment was added by Adam Katz (talkcontribs) at 10:59, 17 November 2004.

The plural "clozes" can be found, so it's a noun. As an adjective, it would be attributive use of the noun, like "tractor" in "tractor parts"; it's not comparable or anything. Equinox 05:42, 23 December 2013 (UTC)