spy vs shadower

spy and shadower both are nouns.

Word	Noun	Adjective	Verb	Adverb
spy	Yes	No	Yes	No
shadower	Yes	No	No	No

As nouns, shadower is a hyponym of spy; that is, shadower is a word with a more specific, narrower meaning than spy:

Other hyponyms of spy include snoop, snooper, shadow, tail.

spy (noun)	shadower (noun)
(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors	a spy employed to follow someone and report their movements
a secret watcher; someone who secretly watches other people

spy (verb)	shadower (verb)
secretly collect sensitive or classified information; engage in espionage
watch, observe, or inquire secretly
catch sight of
catch sight of; to perceive with the eyes