powdery vs small-grained

powdery and small-grained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
powdery	No	Yes	No	No
small-grained	No	Yes	No	No

As adjectives, powdery and small-grained are synonyms defined as:

Other synonyms of powdery include fine-grained, powdered, pulverised, pulverized.

powdery (adjective)	small-grained (adjective)
consisting of fine particles	consisting of fine particles
as if dulled in color with a sprinkling of powder