storage vs stowage

storage and stowage both are nouns.

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

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

Other hyponyms of storage include cold storage, stowing, tankage.

storage (noun)	stowage (noun)
the commercial enterprise of storing goods and materials	the act of packing or storing away
the act of storing something	a room in which things are stored
depositing in a warehouse	the charge for stowing goods
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