small-grained vs powdery

small-grained and powdery both are adjectives.

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

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

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

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