A three-letter word that means "exist" is almost always "are." See if it will work.
Ria
que
it is a three letter word meaning loud noise. the change one letter. from bin to the next to mean loud noise
A three letter word beginning with z has to be Zoo
X-rayXenonXeroxSince the question asked for "three-letter" words beginning with "X", how about "xis"?
Ria
Some three letter words beginning with D are:diddogdoediedendindabduodotdigdrydye
This is a three-letter prefix meaning "an error."
There are none.
que
and Ant
ope
Hue
ope
gnu
flu
The Go Go's