curtness vs abruptness

curtness and abruptness both are nouns.

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

As nouns, curtness and abruptness are synonyms defined as:

Other synonyms of curtness include brusqueness, gruffness, shortness.

curtness (noun)	abruptness (noun)
an abrupt discourteous manner	the quality of happening with headlong haste or without warning
	the property possessed by a slope that is very steep
	an abrupt discourteous manner