silver sagebrush vs grey sage

silver sagebrush and grey sage both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver sagebrush	Yes	No	No	No
grey sage	Yes	No	No	No

As nouns, silver sagebrush and grey sage are synonyms defined as:

silver sagebrush and grey sage: low much-branched perennial of western United States having silvery leaves; an important browse and shelter plant

Other synonyms of silver sagebrush include Artemisia cana, gray sage, Seriphidium canum, silver sage.

silver sagebrush (noun)	grey sage (noun)
low much-branched perennial of western United States having silvery leaves; an important browse and shelter plant	low much-branched perennial of western United States having silvery leaves; an important browse and shelter plant