strong-armer vs malefactor

strong-armer and malefactor both are nouns.

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

As nouns, malefactor is a hypernym of strong-armer; that is, malefactor is a word with a broader meaning than strong-armer:

strong-armer: an aggressive and violent young criminal
malefactor: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of strong-armer include criminal, crook, felon, outlaw.

strong-armer (noun)	malefactor (noun)
an aggressive and violent young criminal	someone who has committed a crime or has been legally convicted of a crime