gentleness vs slope

gentleness and slope both are nouns.

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

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

gentleness: 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 gentleness include gradient.

gentleness (noun)	slope (noun)
acting in a manner that is gentle and mild and even-tempered	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

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