gradient vs gentleness

gradient and gentleness both are nouns.

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

As nouns, gentleness is a hyponym of gradient; that is, gentleness 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
gentleness: the property possessed by a slope that is very gradual

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

gradient (noun)	gentleness (noun)
the property possessed by a line or surface that departs from the horizontal	acting in a manner that is gentle and mild and even-tempered
a graded change in the magnitude of some physical quantity or dimension	the property possessed by a slope that is very gradual