abruptness vs gradient

abruptness and gradient both are nouns.

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

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

abruptness: the property possessed by a slope that is very steep
gradient: the property possessed by a line or surface that departs from the horizontal

Other hypernyms of abruptness include slope.

abruptness (noun)	gradient (noun)
the quality of happening with headlong haste or without warning	the property possessed by a line or surface that departs from the horizontal
the property possessed by a slope that is very steep	a graded change in the magnitude of some physical quantity or dimension
an abrupt discourteous manner