A little contribution to your vocabulary:
zyzzyva - an American weevil or small beetle
Zymurgy - the branch of chemistry concerned with fermentation processes in brewing, etc
Zygomorphic - (of a flower) capable of being cut in only one plane so that the two halves are mirror images
Zarf - (esp in the Middle East) a holder, usually ornamental, for a hot coffee cup
zex - a tool for cutting roof slate
That's probably enough to get you through some tough sports in scrabble or words with friends, eh?
Thanks for another great a-z challenge!