ascendance vs ascendancy

ascendance and ascendancy both are nouns.

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

As nouns, ascendance and ascendancy are synonyms defined as:

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

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

ascendance (noun)	ascendancy (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