gruff vs crusty

gruff and crusty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
gruff	No	Yes	No	No
crusty	No	Yes	No	No

As adjectives, gruff and crusty are synonyms defined as:

Other synonyms of gruff include curmudgeonly, ill-humored, ill-humoured.

gruff (adjective)	crusty (adjective)
deep and harsh sounding as if from shouting or illness or emotion	having a hardened crust as a covering
brusque and surly and forbidding	brusque and surly and forbidding