unconscious vs comatose

unconscious is a noun but comatose is not a noun.

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

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

unconscious (adjective)	comatose (adjective)
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead	relating to or associated with a coma
without conscious volition	in a state of deep and usually prolonged unconsciousness; unable to respond to external stimuli
(followed by `of') not knowing or perceiving