grayish-green vs gray-green

grayish-green and gray-green both are adjectives.

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

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

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

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