shanghaier vs kidnapper

shanghaier and kidnapper both are nouns.

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

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

shanghaier: a kidnapper who drugs men and takes them for compulsory service aboard a ship
kidnapper: someone who unlawfully seizes and detains a victim (usually for ransom)

Other hypernyms of shanghaier include abductor, kidnaper, snatcher.

shanghaier (noun)	kidnapper (noun)
a kidnapper who drugs men and takes them for compulsory service aboard a ship	someone who unlawfully seizes and detains a victim (usually for ransom)