abruptness vs hastiness

abruptness and hastiness both are nouns.

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

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

Other hypernyms of abruptness include haste, hurriedness, hurry, precipitation.

abruptness (noun)	hastiness (noun)
the quality of happening with headlong haste or without warning	hasty impulsiveness
the property possessed by a slope that is very steep	overly eager speed (and possible carelessness)
an abrupt discourteous manner