museum vs depositary

museum and depositary both are nouns.

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

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

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

Other hypernyms of museum include deposit, depository, repository.

museum (noun)	depositary (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