I have trouble with this sort of form mainly because I hold myself to not wanting to 'cheat' - in other words, there are some letters which are more difficult to find words for, and I don't want to bend the poem to use the easy cop-out ones. The word has to be the proper one for the poem AND fit the requirement of the form.
But I found myself having a good deal of trouble thinking of non-copoutish words that end in z. Fez, for example - a fine word, but a little out of place in a poem about meeting someone for the first time when neither of you make a habit of wearing them. Yeah, I could work it in somehow, desecribe something as looking like a fez, say - but that's what I mean by bending the poem to fit the form, and I don't want to do it.
So I thought I would look up a Scrabble website or two, find a list of words ending in z, and read it just to jog my memory. Z is a high worth, tricky kind of letter, so I expected to be able to find such a thing pretty easily. Nope.
I'm fine poem-wise, having had some more thoughts in the interim and also having encountered some useful and appropriate z-ended words in other lists that were available, but curious all the same. A couple of places refer to such a list, or promise it as content - but the links are broken or the pages are gone, or something.