sanatorium vs hospital

sanatorium and hospital both are nouns.

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

As nouns, hospital is a hypernym of sanatorium; that is, hospital is a word with a broader meaning than sanatorium:

sanatorium: a hospital for recuperation or for the treatment of chronic diseases
hospital: a health facility where patients receive treatment

Other hypernyms of sanatorium include infirmary.

sanatorium (noun)	hospital (noun)
a hospital for recuperation or for the treatment of chronic diseases	a health facility where patients receive treatment
pejorative terms for an insane asylum	a medical institution where sick or injured people are given medical or surgical care