gradualness vs slope

gradualness and slope both are nouns.

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

As nouns, slope is a hypernym of gradualness; that is, slope is a word with a broader meaning than gradualness:

gradualness: the property possessed by a slope that is very gradual
slope: the property possessed by a line or surface that departs from the horizontal

Other hypernyms of gradualness include gradient.

gradualness (noun)	slope (noun)
the quality of being gradual or of coming about by gradual stages	the property possessed by a line or surface that departs from the horizontal
the property possessed by a slope that is very gradual	an elevated geological formation

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