curtness vs discourtesy

curtness and discourtesy both are nouns.

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

As nouns, discourtesy is a hypernym of curtness; that is, discourtesy is a word with a broader meaning than curtness:

Other hypernyms of curtness include rudeness.

curtness (noun)	discourtesy (noun)
an abrupt discourteous manner	a lack of politeness; a failure to show regard for others; wounding the feelings of others
	a manner that is rude and insulting
	an expression of lack of respect