figure of speech vs sleeper

figure of speech and sleeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
figure of speech	Yes	No	No	No
sleeper	Yes	No	No	No

figure of speech (noun)	sleeper (noun)
language used in a figurative or nonliteral sense	an unexpected hit
	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