jail bird vs criminal

jail bird and criminal both are nouns.

Word	Noun	Adjective	Verb	Adverb
jail bird	Yes	No	No	No
criminal	Yes	Yes	No	No

As nouns, criminal is a hypernym of jail bird; that is, criminal is a word with a broader meaning than jail bird:

jail bird: a criminal who has been jailed repeatedly
criminal: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of jail bird include crook, felon, malefactor, outlaw.

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

jail bird (adjective)	criminal (adjective)
	guilty of crime or serious offense
	involving or being or having the nature of a crime
	bringing or deserving severe rebuke or censure