slope vs abruptness

slope and abruptness both are nouns.

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

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

slope: 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 slope include grade, pitch, rake, slant, precipitousness, steepness, gentleness, gradualness.

slope (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
an elevated geological formation	the property possessed by a slope that is very steep
	an abrupt discourteous manner

slope (verb)	abruptness (verb)
be at an angle