greyish-green vs grayish-green

greyish-green and grayish-green both are adjectives.

Word	Noun	Adjective	Verb	Adverb
greyish-green	No	Yes	No	No
grayish-green	No	Yes	No	No

As adjectives, greyish-green and grayish-green are synonyms defined as:

Other synonyms of greyish-green include gray-green, grey-green.

greyish-green (adjective)	grayish-green (adjective)
of green tinged with grey	of green tinged with grey