cellar vs excavation

cellar and excavation both are nouns.

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

As nouns, excavation is a hypernym of cellar; that is, excavation is a word with a broader meaning than cellar:

Other hypernyms of cellar include storage space.

cellar (noun)	excavation (noun)
the lowermost portion of a structure partly or wholly below ground level; often used for storage	the act of extracting ores or coal etc from the earth
storage space where wines are stored	the act of digging
an excavation where root vegetables are stored	a hole in the ground made by excavating
	the site of an archeological exploration