knocked out vs stunned

knocked out and stunned both are adjectives.

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

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

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

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