sleeper vs sleep

sleeper and sleep both are nouns.

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

sleeper (noun)	sleep (noun)
an unexpected hit	a natural and periodic state of rest during which consciousness of the world is suspended
tropical fish that resembles a goby and rests quietly on the bottom in shallow water	euphemisms for death (based on an analogy between lying in a bed and in a tomb)
a passenger car that has berths for sleeping	a torpid state resembling deep sleep
one of the cross braces that support the rails on a railway track	a period of time spent sleeping
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)	sleep (verb)
	be asleep
	be able to accommodate for sleeping