plug-ugly vs yobo

plug-ugly and yobo both are nouns.

Word	Noun	Adjective	Verb	Adverb
plug-ugly	Yes	No	No	No
yobo	Yes	No	No	No

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

Other hypernyms of plug-ugly include bully, hooligan, roughneck, rowdy, ruffian, tough, yob, yobbo.

plug-ugly (noun)	yobo (noun)
someone who bullies weaker people	a cruel and brutal fellow