dominion vs dominance

dominion and dominance both are nouns.

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

As nouns, dominance is a hypernym of dominion; that is, dominance is a word with a broader meaning than dominion:

dominion: dominance or power through legal authority
dominance: the state that exists when one person or group has power over another

Other hypernyms of dominion include ascendance, ascendancy, ascendence, ascendency, control.

dominion (noun)	dominance (noun)
a region marked off for administrative or other purposes	the power or right to give orders or make decisions
dominance or power through legal authority	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