museum vs repository

museum and repository both are nouns.

Word	Noun	Adjective	Verb	Adverb
museum	Yes	No	No	No
repository	Yes	No	No	No

As nouns, repository is a hypernym of museum; that is, repository is a word with a broader meaning than museum:

museum: a depository for collecting and displaying objects having scientific or historical or artistic value
repository: a facility where things can be deposited for storage or safekeeping

Other hypernyms of museum include deposit, depositary, depository.

museum (noun)	repository (noun)
a depository for collecting and displaying objects having scientific or historical or artistic value	a facility where things can be deposited for storage or safekeeping
	a burial vault (usually for some famous person)
	a person to whom a secret is entrusted