KO'd vs knocked out

KO'd and knocked out both are adjectives.

Word	Noun	Adjective	Verb	Adverb
KO'd	No	Yes	No	No
knocked out	No	Yes	No	No

As adjectives, KO'd and knocked out are synonyms defined as:

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

KO'd (adjective)	knocked out (adjective)
knocked unconscious by a heavy blow	knocked unconscious by a heavy blow