crusty vs gruff

crusty and gruff both are adjectives.

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

As adjectives, crusty and gruff are synonyms defined as:

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

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