potency vs say-so

potency and say-so both are nouns.

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

As nouns, potency and say-so are synonyms defined as:

Other synonyms of potency include authorisation, authority, authorization, dominance.

potency (noun)	say-so (noun)
capacity to produce strong physiological or chemical effects	the power or right to give orders or make decisions
the power or right to give orders or make decisions	an authoritative declaration
the state of being potent; a male's capacity to have sexual intercourse	one chap's arbitrary assertion
the inherent capacity for coming into being