commodiousness vs capaciousness

commodiousness and capaciousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
commodiousness	Yes	No	No	No
capaciousness	Yes	No	No	No

As nouns, commodiousness and capaciousness are synonyms defined as:

commodiousness and capaciousness: spatial largeness and extensiveness (especially inside a building)

Other synonyms of commodiousness include roominess, spaciousness.

commodiousness (noun)	capaciousness (noun)
spatial largeness and extensiveness (especially inside a building)	spatial largeness and extensiveness (especially inside a building)
	intellectual breadth