acclivitous vs rising

acclivitous is not a noun while rising is a noun.

Word	Noun	Adjective	Verb	Adverb
acclivitous	No	Yes	No	No
rising	Yes	Yes	No	No

As adjectives, acclivitous and rising are synonyms defined as:

Other synonyms of acclivitous include uphill.

acclivitous (noun)	rising (noun)
	organized opposition to authority; a conflict in which one faction tries to wrest control from another
	a movement upward; rise above the ground

acclivitous (adjective)	rising (adjective)
sloping upward	advancing or becoming higher or greater in degree or value or status
	sloping upward
	coming to maturity
	newly come into prominence