muscle system vs muscle

muscle system and muscle both are nouns.

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

muscle system (noun)	muscle (noun)
the muscular system of an organism	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

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