silvery-gray vs silvery-grey

silvery-gray and silvery-grey both are adjectives.

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

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

Other synonyms of silvery-gray include silver-gray, silver-grey.

silvery-gray (adjective)	silvery-grey (adjective)
of grey resembling silver	of grey resembling silver