brown-gray vs brown-grey

brown-gray and brown-grey both are adjectives.

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

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

Other synonyms of brown-gray include brownish-gray, brownish-grey.

brown-gray (adjective)	brown-grey (adjective)
of grey tinged with brown	of grey tinged with brown