mental hospital vs psychiatric hospital

mental hospital and psychiatric hospital both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental hospital	Yes	No	No	No
psychiatric hospital	Yes	No	No	No

As nouns, mental hospital and psychiatric hospital are synonyms defined as:

mental hospital and psychiatric hospital: a hospital for mentally incompetent or unbalanced person

Other synonyms of mental hospital include asylum, insane asylum, institution, mental home, mental institution.

mental hospital (noun)	psychiatric hospital (noun)
a hospital for mentally incompetent or unbalanced person	a hospital for mentally incompetent or unbalanced person