Where can I find some words with the graphemes x and y in them?

Try xylophone, xylem... if you look up xylem on the free dictionary and then scroll down to the bottom... you will see an amazing no of Words with x and y in them... :-)

ATAXY

BRAXY

DEOXY

DRUXY

EPOXY

FLAXY

HEXYL

LAXLY

OXEYE

PREXY

PROXY

SIXTY

XYLAN

XYLEM

XYLIC

XYLOL

XYLYL

XYSTI

XYSTS