rowdy vs tough guy

rowdy and tough guy both are nouns.

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

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

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

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

rowdy (adjective)	tough guy (adjective)
disturbing the public peace; loud and rough