shanghai vs kidnap

shanghai and kidnap both are verbs.

Word	Noun	Adjective	Verb	Adverb
shanghai	No	No	Yes	No
kidnap	No	No	Yes	No

As verbs, kidnap is a hypernym of shanghai; that is, kidnap is a word with a broader meaning than shanghai:

shanghai: take (someone) against his will for compulsory service, especially on board a ship
kidnap: take away to an undisclosed location against their will and usually in order to extract a ransom

Other hypernyms of shanghai include abduct, nobble, snatch.

shanghai (verb)	kidnap (verb)
take (someone) against his will for compulsory service, especially on board a ship	take away to an undisclosed location against their will and usually in order to extract a ransom