stowing vs stowage

stowing and stowage both are nouns.

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

As nouns, stowing and stowage are synonyms defined as:

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