stunned vs knocked out

stunned and knocked out both are adjectives.

Word	Noun	Adjective	Verb	Adverb
stunned	No	Yes	No	No
knocked out	No	Yes	No	No

As adjectives, stunned and knocked out are synonyms defined as:

Other synonyms of stunned include kayoed, KO'd, out.

stunned (adjective)	knocked out (adjective)
in a state of mental numbness especially as resulting from shock	knocked unconscious by a heavy blow
filled with the emotional impact of overwhelming surprise or shock
knocked unconscious by a heavy blow