unconscious vs KO'd

unconscious is a noun but KO'd is not a noun.

Word	Noun	Adjective	Verb	Adverb
unconscious	Yes	Yes	No	No
KO'd	No	Yes	No	No

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

unconscious (adjective)	KO'd (adjective)
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead	knocked unconscious by a heavy blow
without conscious volition
(followed by `of') not knowing or perceiving