psychotherapeutics vs mental hygiene

psychotherapeutics and mental hygiene both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychotherapeutics	Yes	No	No	No
mental hygiene	Yes	No	No	No

As nouns, psychotherapeutics and mental hygiene are synonyms defined as:

psychotherapeutics and mental hygiene: the branch of psychiatry concerned with psychological methods

Other synonyms of psychotherapeutics include psychotherapy.

psychotherapeutics (noun)	mental hygiene (noun)
the branch of psychiatry concerned with psychological methods	the branch of psychiatry concerned with psychological methods