preciousness vs expensiveness

preciousness and expensiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
preciousness	Yes	No	No	No
expensiveness	Yes	No	No	No

As nouns, expensiveness is a hypernym of preciousness; that is, expensiveness is a word with a broader meaning than preciousness:

preciousness: the quality possessed by something with a great price or value
expensiveness: the quality of being high-priced

preciousness (noun)	expensiveness (noun)
the positive quality of being precious and beyond value	the quality of being high-priced
the quality of being fastidious or excessively refined
the quality possessed by something with a great price or value