gaolbird vs malefactor

gaolbird and malefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaolbird	Yes	No	No	No
malefactor	Yes	No	No	No

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

gaolbird: a criminal who has been jailed repeatedly
malefactor: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of gaolbird include criminal, crook, felon, outlaw.

gaolbird (noun)	malefactor (noun)
a criminal who has been jailed repeatedly	someone who has committed a crime or has been legally convicted of a crime