basement vs cellar

basement and cellar both are nouns.

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

As nouns, basement and cellar are synonyms defined as:

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

basement (noun)	cellar (noun)
the lowermost portion of a structure partly or wholly below ground level; often used for storage	the lowermost portion of a structure partly or wholly below ground level; often used for storage
the ground floor facade or interior in Renaissance architecture	storage space where wines are stored
	an excavation where root vegetables are stored