In case anyone's wondering, "mons" is not allowed in Chihuahua at present.
In its most common usage (= mons pubis, a mound of fatty tissue covering the pubic area), it is not a plural, but it can also be the plural of "mon" (dialect for man; also a Japanese family crest). Maybe "mons" should be allowed, by analogy with our decision a while ago on "does", which could be a bunch of female deer, but is more usually a conjugation of "do". Any thoughts?
PS, Binkie, your "extraordinary word" has me agog with curiosity. Now, when I play that puzzle I'll be trying to think of all the most unlikely possibilities. (This isn't just a plot to get everyone else's hit rate down, is it?)