ascendency vs ascendance

ascendency and ascendance both are nouns.

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

As nouns, ascendency and ascendance are synonyms defined as:

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

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

ascendency (noun)	ascendance (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