seizer vs snatcher

seizer and snatcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
seizer	Yes	No	No	No
snatcher	Yes	No	No	No

As nouns, snatcher is a hypernym of seizer; that is, snatcher is a word with a broader meaning than seizer:

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

Other hypernyms of seizer include abductor, kidnaper, kidnapper.

seizer (noun)	snatcher (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)
	a thief who grabs and runs