kidnapper vs kidnaper

kidnapper and kidnaper both are nouns.

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

As nouns, kidnapper and kidnaper are synonyms defined as:

kidnapper and kidnaper: someone who unlawfully seizes and detains a victim (usually for ransom)

Other synonyms of kidnapper include abductor, snatcher.

kidnapper (noun)	kidnaper (noun)
someone who unlawfully seizes and detains a victim (usually for ransom)	someone who unlawfully seizes and detains a victim (usually for ransom)