muscle vs yob

muscle and yob both are nouns.

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

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

Other hypernyms of muscle include bully, hooligan, roughneck, rowdy, ruffian, tough, yobbo, yobo.

muscle (noun)	yob (noun)
possessing muscular strength	a cruel and brutal fellow
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 (verb)	yob (verb)
make one's way by force