saneness vs mental health

saneness and mental health both are nouns.

Word	Noun	Adjective	Verb	Adverb
saneness	Yes	No	No	No
mental health	Yes	No	No	No

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

saneness: normal or sound powers of mind
mental health: the psychological state of someone who is functioning at a satisfactory level of emotional and behavioral adjustment

saneness (noun)	mental health (noun)
normal or sound powers of mind	the psychological state of someone who is functioning at a satisfactory level of emotional and behavioral adjustment