storage vs powder store

storage and powder store both are nouns.

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

As nouns, powder store is a hyponym of storage; that is, powder store is a word with a more specific, narrower meaning than storage:

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

storage (noun)	powder store (noun)
the commercial enterprise of storing goods and materials	a storehouse (as a compartment on a warship) where weapons and ammunition are stored
the act of storing something
depositing in a warehouse
a depository for goods
an electronic memory device
(computer science) the process of storing information in a computer memory or on a magnetic tape or disk