muscle vs say-so

muscle and say-so both are nouns.

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

As nouns, say-so is a hypernym of muscle; that is, say-so is a word with a broader meaning than muscle:

muscle: authority or power or force (especially when used in a coercive way)
say-so: the power or right to give orders or make decisions

Other hypernyms of muscle include authorisation, authority, authorization, dominance, potency.

muscle (noun)	say-so (noun)
possessing muscular strength	the power or right to give orders or make decisions
authority or power or force (especially when used in a coercive way)	an authoritative declaration
one of the contractile organs of the body	one chap's arbitrary assertion
animal tissue consisting predominantly of contractile cells
a bully employed as a thug or bodyguard

muscle (verb)	say-so (verb)
make one's way by force