cellar vs cellarage

cellar and cellarage both are nouns.

Word	Noun	Adjective	Verb	Adverb
cellar	Yes	No	No	No
cellarage	Yes	No	No	No

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

cellar: the lowermost portion of a structure partly or wholly below ground level; often used for storage
cellarage: a storage area in a cellar

cellar (noun)	cellarage (noun)
the lowermost portion of a structure partly or wholly below ground level; often used for storage	a storage area in a cellar
storage space where wines are stored	a charge for storing goods in a cellar
an excavation where root vegetables are stored