ascendant vs ascendance

ascendant and ascendance both are nouns.

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

As nouns, ascendance is a hypernym of ascendant; that is, ascendance is a word with a broader meaning than ascendant:

ascendant: position or state of being dominant or in control
ascendance: the state that exists when one person or group has power over another

Other hypernyms of ascendant include ascendancy, ascendence, ascendency, control, dominance.

ascendant (noun)	ascendance (noun)
someone from whom you are descended (but usually more remote than a grandparent)	the state that exists when one person or group has power over another
position or state of being dominant or in control

ascendant (adjective)	ascendance (adjective)
tending or directed upward
most powerful or important or influential