xmas

Seasoning.

gouda

appetizing

Gateaux

Xylitol

(Shame. You should have used real sugar!)

latex

Xerotherm - a fabric used by divers

mix

XO

(Internet slang for a combination of hugs and kisses )

ox

Xingu River Ray

(There were a couple of references to Xanti Yaks, which would have brought us back full circle. But I couldn't find anything authoritative.)

yarn

so i'll let the multiple words slide, but i think it's more challenging to think of a single word!

I'll also concede defeat because I challenged myself to only use words that end in x and I can't think of any words that start with y and end in x!!!!

good show bob

narrative

There were some one-word X animals, but I thought the ray was the coolest.

e-book