powder magazine vs powder store

powder magazine and powder store both are nouns.

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

As nouns, powder magazine and powder store are synonyms defined as:

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

Other synonyms of powder magazine include magazine.

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