prepotency vs ascendency

prepotency and ascendency both are nouns.

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

As nouns, ascendency is a hypernym of prepotency; that is, ascendency is a word with a broader meaning than prepotency:

prepotency: the state of being predominant over others
ascendency: the state that exists when one person or group has power over another

Other hypernyms of prepotency include ascendance, ascendancy, ascendence, control, dominance.

prepotency (noun)	ascendency (noun)
the state of being predominant over others	the state that exists when one person or group has power over another