gruffness vs abruptness

gruffness and abruptness both are nouns.

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

As nouns, gruffness and abruptness are synonyms defined as:

Other synonyms of gruffness include brusqueness, curtness, shortness.

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