hoodlum vs felon

hoodlum and felon both are nouns.

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

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

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

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

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