stone-gray vs slaty-gray

stone-gray and slaty-gray both are adjectives.

Word	Noun	Adjective	Verb	Adverb
stone-gray	No	Yes	No	No
slaty-gray	No	Yes	No	No

As adjectives, stone-gray and slaty-gray are synonyms defined as:

Other synonyms of stone-gray include slate-gray, slate-grey, slatey, slaty-grey, slaty, stone-grey.

stone-gray (adjective)	slaty-gray (adjective)
of the color of slate or granite	of the color of slate or granite