From Z to A: ZYZZYVA

The ZYZZYVA is a weevil found in South America.

A WEEVIL is a kind of beetle.

According to Wikipedia:

It was first discovered in 1922 in Brazil and named by an Irishman.

Thomas Lincoln Casey, Jr., an entomologist at New York's Museum of Natural History thought that, because there was not a Latin name or Brazilian name associated with this weevil, it was probably named Zyzzyva as a practical joke to place it in a prominent ending position in many guides and manuals.

So ZYZZYVA can be pluralized ZYZZYVA(S), and WEEVIL can of course be pluralized WEEVIL(S).

There is also a magazine called ZYZZYVA, so named because its creators wanted it to be "the last word," and ZYZZYVA is actually the last word in the American Heritage dictionary. (At least it was in 1985 when the magazine was founded.) http://www.zyzzyva.org/.

(It is no longer the last word in the Scrabble dictionary, since ZZZ took over that spot in the 5th edition.)