kidnap vs shanghai

kidnap and shanghai both are verbs.

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

As verbs, shanghai is a hyponym of kidnap; that is, shanghai is a word with a more specific, narrower meaning than kidnap:

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

Other hyponyms of kidnap include impress.

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