abruptness vs rudeness

abruptness and rudeness both are nouns.

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

As nouns, rudeness is a hypernym of abruptness; that is, rudeness is a word with a broader meaning than abruptness:

Other hypernyms of abruptness include discourtesy.

abruptness (noun)	rudeness (noun)
the quality of happening with headlong haste or without warning	a manner that is rude and insulting
the property possessed by a slope that is very steep	a wild or unrefined state
an abrupt discourteous manner