sleeper vs spy

sleeper and spy both are nouns.

sleeper is not a verb while spy is a verb.

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

As nouns, spy is a hypernym of sleeper; that is, spy is a word with a broader meaning than sleeper:

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
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

Other hypernyms of sleeper include diversionist, saboteur, wrecker, undercover agent, terrorist.

sleeper (noun)	spy (noun)
an unexpected hit	(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
tropical fish that resembles a goby and rests quietly on the bottom in shallow water	a secret watcher; someone who secretly watches other people
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

sleeper (verb)	spy (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 sleeper and spy

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