sovereignty vs authority

sovereignty and authority both are nouns.

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

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

Other hypernyms of sovereignty include authorisation, authorization, dominance, potency, say-so.

sovereignty (noun)	authority (noun)
the authority of a state to govern another state	the power or right to give orders or make decisions
government free from external control	official permission or approval
royal authority; the dominion of a monarch	freedom from doubt; belief in yourself and your abilities
	an authoritative written work
	an administrative unit of government
	an expert whose views are taken as definitive
	(usually plural) persons who exercise (administrative) control over others