sovereignty vs dominion

sovereignty and dominion both are nouns.

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

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

Other hypernyms of sovereignty include rule.

sovereignty (noun)	dominion (noun)
the authority of a state to govern another state	a region marked off for administrative or other purposes
government free from external control	dominance or power through legal authority
royal authority; the dominion of a monarch