unconscious vs asleep

unconscious is a noun but asleep is not a noun.

Word	Noun	Adjective	Verb	Adverb
unconscious	Yes	Yes	No	No
asleep	No	Yes	No	Yes

unconscious (noun)	asleep (noun)
that part of the mind wherein psychic activity takes place of which the person is unaware

unconscious (adjective)	asleep (adjective)
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead	in a state of sleep
without conscious volition	dead
(followed by `of') not knowing or perceiving	lacking sensation

unconscious (adverb)	asleep (adverb)
	into a sleeping state
	in the sleep of death