learned vs knowing

learned is not a noun while knowing is a noun.

Word	Noun	Adjective	Verb	Adverb
learned	No	Yes	No	No
knowing	Yes	Yes	No	No

As adjectives, learned and knowing are synonyms defined as:

learned and knowing: highly educated; having extensive information or understanding

Other synonyms of learned include knowledgeable, lettered, well-educated, well-read.

learned (noun)	knowing (noun)
	a clear and certain mental apprehension

learned (adjective)	knowing (adjective)
established by conditioning or learning	highly educated; having extensive information or understanding
highly educated; having extensive information or understanding	evidencing the possession of inside information
having or showing profound knowledge	characterized by conscious design or purpose
	alert and fully informed