yellowish-gray vs yellowish-grey

yellowish-gray and yellowish-grey both are adjectives.

Word	Noun	Adjective	Verb	Adverb
yellowish-gray	No	Yes	No	No
yellowish-grey	No	Yes	No	No

As adjectives, yellowish-gray and yellowish-grey are synonyms defined as:

Other synonyms of yellowish-gray include yellow-gray, yellow-grey.

yellowish-gray (adjective)	yellowish-grey (adjective)
of grey tinged with yellow	of grey tinged with yellow