dominance vs ascendancy

dominance and ascendancy both are nouns.

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

As nouns, dominance and ascendancy are synonyms defined as:

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

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

dominance (noun)	ascendancy (noun)
the power or right to give orders or make decisions	the state that exists when one person or group has power over another
superior development of one side of the body
the organic phenomenon in which one of a pair of alleles present in a genotype is expressed in the phenotype and the other allele of the pair is not
the state that exists when one person or group has power over another