muscleman vs yobo

muscleman and yobo both are nouns.

Word	Noun	Adjective	Verb	Adverb
muscleman	Yes	No	No	No
yobo	Yes	No	No	No

As nouns, yobo is a hypernym of muscleman; that is, yobo is a word with a broader meaning than muscleman:

Other hypernyms of muscleman include bully, hooligan, roughneck, rowdy, ruffian, tough, yob, yobbo.

muscleman (noun)	yobo (noun)
a bully employed as a thug or bodyguard	a cruel and brutal fellow
someone who does special exercises to develop a brawny musculature