tough guy vs Teddy boy

tough guy and Teddy boy both are nouns.

Word	Noun	Adjective	Verb	Adverb
tough guy	Yes	No	No	No
Teddy boy	Yes	No	No	No

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

tough guy: someone who bullies weaker people
Teddy boy: a tough youth of 1950's and 1960's wearing Edwardian style clothes

Other hyponyms of tough guy include Ted.

tough guy (noun)	Teddy boy (noun)
someone who bullies weaker people	a tough youth of 1950's and 1960's wearing Edwardian style clothes