hoodlum vs strong-armer

hoodlum and strong-armer both are nouns.

Word	Noun	Adjective	Verb	Adverb
hoodlum	Yes	No	No	No
strong-armer	Yes	No	No	No

As nouns, hoodlum and strong-armer are synonyms defined as:

Other synonyms of hoodlum include goon, hood, punk, thug, tough, toughie.

hoodlum (noun)	strong-armer (noun)
an aggressive and violent young criminal	an aggressive and violent young criminal