YP = yup
YQ - Yuraq Yuraq
The obscure Bolivian mountain so nice they named it twice!: Yuraq Yuraq - Wikipedia
YR: yellowhammer
YS: yes
YT: yurt
YU = you
YV = Anton Yurikov, a Russian candidate from the Liberal Progressive Party who received 5.8% of the vote for the Cheryomushki single-mandate constituency for the state Duma in the 2016 electio(.
Disclaimer: Any resemblance to a political commentary is inadvertent and coincidental.)
YZ - yaz (A drug though to this Old New Englander it will always mean Red Sox player Carl “Yaz” Yastrzemski)
YW = yew
(Annie, you skipped a couple. YV and YY do look a bit alike.)
(Ooops. Sorry)
YY - yearly
Now on to ZA
YX = yex.
a hiccup or belch.
NOW on to ZA.
ZA - zebra
ZB - Zab
ZC = zinc
ZD = zeroed
ZE = zygote
ZF - zarf
ZG: zigzag
ZH: zoomorph
ZI = zombi