stowage vs stock room

stowage and stock room both are nouns.

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

As nouns, stock room is a hyponym of stowage; that is, stock room is a word with a more specific, narrower meaning than stowage:

Other hyponyms of stowage include chandlery, lumber room, buttery, larder, pantry, stockroom, strongroom.

stowage (noun)	stock room (noun)
the act of packing or storing away	storeroom for storing goods and supplies used in a business
a room in which things are stored
the charge for stowing goods