incline vs acclivity

incline and acclivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
incline	Yes	No	Yes	No
acclivity	Yes	No	No	No

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

incline (noun)	acclivity (noun)
an inclined surface connecting two levels	an upward slope or grade (as in a road)
an elevated geological formation

incline (verb)	acclivity (verb)
make receptive or willing towards an action or attitude or belief
feel favorably disposed or willing
be at an angle
lower or bend (the head or upper body), as in a nod or bow
bend or turn (one's ear) towards a speaker in order to listen well
have a tendency or disposition to do or be something; be inclined