rising vs ascension

rising and ascension both are nouns.

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

As nouns, rising and ascension are synonyms defined as:

Other synonyms of rising include ascent, rise.

rising (noun)	ascension (noun)
organized opposition to authority; a conflict in which one faction tries to wrest control from another	the act of changing location in an upward direction
a movement upward; rise above the ground	a movement upward; rise above the ground
	(astronomy) the rising of a star above the horizon

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