say-so vs sovereignty

say-so and sovereignty both are nouns.

Word	Noun	Adjective	Verb	Adverb
say-so	Yes	No	No	No
sovereignty	Yes	No	No	No

As nouns, sovereignty is a hyponym of say-so; that is, sovereignty is a word with a more specific, narrower meaning than say-so:

Other hyponyms of say-so include power of appointment, carte blanche, command, imperium, lordship, muscle.

say-so (noun)	sovereignty (noun)
the power or right to give orders or make decisions	the authority of a state to govern another state
an authoritative declaration	government free from external control
one chap's arbitrary assertion	royal authority; the dominion of a monarch