mental disorder vs psychological disorder

mental disorder and psychological disorder both are nouns.

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

As nouns, mental disorder and psychological disorder are synonyms defined as:

mental disorder and psychological disorder: (psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness

Other synonyms of mental disorder include disturbance, folie, mental disturbance.

mental disorder (noun)	psychological disorder (noun)
(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness	(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness