sphincter muscle vs muscle

sphincter muscle and muscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphincter muscle	Yes	No	No	No
muscle	Yes	No	Yes	No

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

Other hypernyms of sphincter muscle include musculus.

sphincter muscle (noun)	muscle (noun)
a ring of muscle that contracts to close an opening	possessing muscular strength
	authority or power or force (especially when used in a coercive way)
	one of the contractile organs of the body
	animal tissue consisting predominantly of contractile cells
	a bully employed as a thug or bodyguard

sphincter muscle (verb)	muscle (verb)
	make one's way by force