toughie vs felon

toughie and felon both are nouns.

Word	Noun	Adjective	Verb	Adverb
toughie	Yes	No	No	No
felon	Yes	No	No	No

As nouns, felon is a hypernym of toughie; that is, felon is a word with a broader meaning than toughie:

toughie: an aggressive and violent young criminal
felon: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of toughie include criminal, crook, malefactor, outlaw.

toughie (noun)	felon (noun)
a particularly difficult or baffling question or problem	someone who has committed a crime or has been legally convicted of a crime
an aggressive and violent young criminal	a purulent infection at the end of a finger or toe in the area surrounding the nail