schizothymia vs mental disorder

schizothymia and mental disorder both are nouns.

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

As nouns, mental disorder is a hypernym of schizothymia; that is, mental disorder is a word with a broader meaning than schizothymia:

schizothymia: resembling schizophrenia but remaining within the bounds of normality
mental disorder: (psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness

Other hypernyms of schizothymia include disturbance, folie, mental disturbance, psychological disorder.

schizothymia (noun)	mental disorder (noun)
resembling schizophrenia but remaining within the bounds of normality	(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness