psychological medicine vs psychological disorder

psychological medicine and psychological disorder both are nouns.

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

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