spy vs sleeper

spy and sleeper both are nouns.

spy is a verb but sleeper is not a verb.

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

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

spy: (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
sleeper: a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal

Other hyponyms of spy include counterspy, mole, double agent, espionage agent, foreign agent, infiltrator.

spy (noun)	sleeper (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	an unexpected hit
a secret watcher; someone who secretly watches other people	tropical fish that resembles a goby and rests quietly on the bottom in shallow water
	a passenger car that has berths for sleeping
	one of the cross braces that support the rails on a railway track
	a piece of furniture that can be opened up into a bed
	pajamas with feet; worn by children
	a rester who is sleeping
	an unexpected achiever of success
	a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal

spy (verb)	sleeper (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

Difference between spy and sleeper

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