kidnapper vs outlaw

kidnapper and outlaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
kidnapper	Yes	No	No	No
outlaw	Yes	Yes	Yes	No

As nouns, outlaw is a hypernym of kidnapper; that is, outlaw is a word with a broader meaning than kidnapper:

kidnapper: someone who unlawfully seizes and detains a victim (usually for ransom)
outlaw: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of kidnapper include captor, capturer, criminal, crook, felon, malefactor.

kidnapper (noun)	outlaw (noun)
someone who unlawfully seizes and detains a victim (usually for ransom)	someone who has committed a crime or has been legally convicted of a crime

kidnapper (adjective)	outlaw (adjective)
	contrary to or forbidden by law
	disobedient to or defiant of law

kidnapper (verb)	outlaw (verb)
	declare illegal; outlaw