quesy
anxious
X-rayXenonXeroxSince the question asked for "three-letter" words beginning with "X", how about "xis"?
A four letter word beginning with C and ending with X is crux.
There is no synonym for awesome beginning with the letter x.
repulsion
Xylophone, xray,
x-ray
x-ray
No country begins with the letter X.
There are no countries with the letter X as the second letter. There are also no countries beginning with the letter X.
There are none.