yob vs tough guy

yob and tough guy both are nouns.

Word	Noun	Adjective	Verb	Adverb
yob	Yes	No	No	No
tough guy	Yes	No	No	No

As nouns, tough guy is a hyponym of yob; that is, tough guy is a word with a more specific, narrower meaning than yob:

Other hyponyms of yob include bullyboy, muscle, muscleman, skin, skinhead, plug-ugly.

yob (noun)	tough guy (noun)
a cruel and brutal fellow	someone who bullies weaker people