sanatorium vs sanitarium

sanatorium and sanitarium both are nouns.

Word	Noun	Adjective	Verb	Adverb
sanatorium	Yes	No	No	No
sanitarium	Yes	No	No	No

As nouns, sanatorium and sanitarium are synonyms defined as:

sanatorium and sanitarium: a hospital for recuperation or for the treatment of chronic diseases

Other synonyms of sanatorium include sanatarium.

sanatorium (noun)	sanitarium (noun)
a hospital for recuperation or for the treatment of chronic diseases	a hospital for recuperation or for the treatment of chronic diseases
pejorative terms for an insane asylum