hospital vs institution

hospital and institution both are nouns.

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

As nouns, institution is a hyponym of hospital; that is, institution is a word with a more specific, narrower meaning than hospital:

hospital (noun)	institution (noun)
a health facility where patients receive treatment	the act of starting something for the first time; introducing something new
a medical institution where sick or injured people are given medical or surgical care	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