ruffian vs muscle

ruffian and muscle both are nouns.

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

As nouns, muscle is a hyponym of ruffian; that is, muscle is a word with a more specific, narrower meaning than ruffian:

Other hyponyms of ruffian include bullyboy, muscleman, skin, skinhead, plug-ugly, tough guy.

ruffian (noun)	muscle (noun)
a cruel and brutal fellow	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

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