learned vs psychology

learned is not a noun while psychology is a noun.

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

learned (noun)	psychology (noun)
	the science of mental life

learned (adjective)	psychology (adjective)
established by conditioning or learning
highly educated; having extensive information or understanding
having or showing profound knowledge