basement vs cellarage

basement and cellarage both are nouns.

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

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

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

basement (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
the ground floor facade or interior in Renaissance architecture	a charge for storing goods in a cellar