The hardest word I could think for for "x" is.... Xenophobia! (Since I recently read a book about different types of phobias. xD)
It's an unreasonable fear or hatred of foreigners or strangers or of that which is foreign or strange.

That word is racist! DX lol
I jk, but it is! But I have nothing against you or anything. lol
My word for, y?
Darn... Can't think of one... Gah!

Yamoussukro

Capital of the Ivory Coast.
HAHAHA! I THOUGHT OF ONE! *hides Geography book shamefully*
*smiles* No one saw that...
:(

It fell off of the first page... So...
A word that starts with Z...
Let me think...

ZIRCONIUM

a metallic element found combined in zircon, baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous enamels.

Starting back at A? o3o

Anesthesiology. :D

Balbutient