insane asylum vs psychiatric hospital

insane asylum and psychiatric hospital both are nouns.

Word	Noun	Adjective	Verb	Adverb
insane asylum	Yes	No	No	No
psychiatric hospital	Yes	No	No	No

As nouns, insane asylum and psychiatric hospital are synonyms defined as:

insane asylum and psychiatric hospital: a hospital for mentally incompetent or unbalanced person

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

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