unconscious vs stunned

unconscious is a noun but stunned is not a noun.

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

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

unconscious (adjective)	stunned (adjective)
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead	in a state of mental numbness especially as resulting from shock
without conscious volition	filled with the emotional impact of overwhelming surprise or shock
(followed by `of') not knowing or perceiving	knocked unconscious by a heavy blow