ascent vs ascension

ascent and ascension both are nouns.

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

As nouns, ascent and ascension are synonyms defined as:

ascent and ascension: the act of changing location in an upward direction

Other synonyms of ascent include ascending, rise.

As nouns, ascent and ascension are synonyms defined as:

Other synonyms of ascent include rise, rising.

ascent (noun)	ascension (noun)
the act of changing location in an upward direction	the act of changing location in an upward direction
a movement upward; rise above the ground	a movement upward; rise above the ground
an upward slope or grade (as in a road)	(astronomy) the rising of a star above the horizon