gradient vs abruptness

gradient and abruptness both are nouns.

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

As nouns, abruptness is a hyponym of gradient; that is, abruptness is a word with a more specific, narrower meaning than gradient:

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

Other hyponyms of gradient include grade, pitch, rake, slant, precipitousness, steepness, gentleness, gradualness.

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