powder store vs storehouse

powder store and storehouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
powder store	Yes	No	No	No
storehouse	Yes	No	No	No

As nouns, storehouse is a hypernym of powder store; that is, storehouse is a word with a broader meaning than powder store:

powder store: a storehouse (as a compartment on a warship) where weapons and ammunition are stored
storehouse: a depository for goods

Other hypernyms of powder store include depot, entrepot, storage, store.

powder store (noun)	storehouse (noun)
a storehouse (as a compartment on a warship) where weapons and ammunition are stored	a depository for goods