stowage vs storage room

stowage and storage room both are nouns.

Word	Noun	Adjective	Verb	Adverb
stowage	Yes	No	No	No
storage room	Yes	No	No	No

As nouns, stowage and storage room are synonyms defined as:

Other synonyms of stowage include storeroom.

stowage (noun)	storage room (noun)
the act of packing or storing away	a room in which things are stored
a room in which things are stored
the charge for stowing goods