brownish-gray vs brown-gray

brownish-gray and brown-gray both are adjectives.

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

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

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

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