capturer vs kidnapper

capturer and kidnapper both are nouns.

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

As nouns, kidnapper is a hyponym of capturer; that is, kidnapper is a word with a more specific, narrower meaning than capturer:

capturer: a person who captures and holds people or animals
kidnapper: someone who unlawfully seizes and detains a victim (usually for ransom)

Other hyponyms of capturer include abductor, kidnaper, snatcher, surpriser.

capturer (noun)	kidnapper (noun)
a person who captures and holds people or animals	someone who unlawfully seizes and detains a victim (usually for ransom)