discourtesy vs crust

discourtesy and crust both are nouns.

Word	Noun	Adjective	Verb	Adverb
discourtesy	Yes	No	No	No
crust	Yes	No	Yes	No

As nouns, crust is a hyponym of discourtesy; that is, crust is a word with a more specific, narrower meaning than discourtesy:

discourtesy (noun)	crust (noun)
a lack of politeness; a failure to show regard for others; wounding the feelings of others	the trait of being rude and impertinent; inclined to take liberties
a manner that is rude and insulting	the outer layer of the Earth
an expression of lack of respect	a hard outer layer that covers something

discourtesy (verb)	crust (verb)
	form a crust or form into a crust