preciousness vs costliness

preciousness and costliness both are nouns.

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

As nouns, preciousness and costliness are synonyms defined as:

preciousness and costliness: the quality possessed by something with a great price or value

Other synonyms of preciousness include dearness.

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