brusqueness vs abruptness

brusqueness and abruptness both are nouns.

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

As nouns, brusqueness and abruptness are synonyms defined as:

Other synonyms of brusqueness include curtness, gruffness, shortness.

brusqueness (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