psychological disorder vs psychological medicine

psychological disorder and psychological medicine both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychological disorder	Yes	No	No	No
psychological medicine	Yes	No	No	No

psychological disorder (noun)	psychological medicine (noun)
(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness	the branch of medicine dealing with the diagnosis and treatment of mental disorders