law offender vs malefactor

law offender and malefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
law offender	Yes	No	No	No
malefactor	Yes	No	No	No

As nouns, malefactor is a hypernym of law offender; that is, malefactor is a word with a broader meaning than law offender:

law offender: someone who violates the law
malefactor: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of law offender include criminal, crook, felon, outlaw.

law offender (noun)	malefactor (noun)
someone who violates the law	someone who has committed a crime or has been legally convicted of a crime