domination vs ascendancy

domination and ascendancy both are nouns.

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

As nouns, ascendancy is a hypernym of domination; that is, ascendancy is a word with a broader meaning than domination:

domination: power to dominate or defeat
ascendancy: the state that exists when one person or group has power over another

Other hypernyms of domination include ascendance, ascendence, ascendency, control, dominance.

domination (noun)	ascendancy (noun)
social control by dominating	the state that exists when one person or group has power over another
power to dominate or defeat