zeal
Zeal is one.
There is no word in the English language that starts with Y and ends with Z.
What starts with T and ends with Z? if looking for a word that starts with T and ends with Z, then; five (5) letter word: trooz. topaz. nine (9) letter word: terahertz.
Zebra
zirconia
Zebra
Zebra
zany
zenith
alchochaz
Zebra