ascendence vs ascendency

ascendence and ascendency both are nouns.

Word	Noun	Adjective	Verb	Adverb
ascendence	Yes	No	No	No
ascendency	Yes	No	No	No

As nouns, ascendence and ascendency are synonyms defined as:

ascendence and ascendency: the state that exists when one person or group has power over another

Other synonyms of ascendence include ascendance, ascendancy, control, dominance.

ascendence (noun)	ascendency (noun)
the state that exists when one person or group has power over another	the state that exists when one person or group has power over another