sanatorium vs institution

sanatorium and institution both are nouns.

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

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

sanatorium (noun)	institution (noun)
a hospital for recuperation or for the treatment of chronic diseases	the act of starting something for the first time; introducing something new
pejorative terms for an insane asylum	an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
	a hospital for mentally incompetent or unbalanced person
	a custom that for a long time has been an important feature of some group or society
	an organization founded and united for a specific purpose