slaty-gray vs slatey

slaty-gray and slatey both are adjectives.

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

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

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

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