Costliness is a synonym of priciness.
As nouns the difference between costliness and priciness
is that costliness is the characteristic of being costly while priciness is the quality of being pricy, that is, expensive.
costliness
English
Noun
(-)
The characteristic of being costly.
priciness
English
Alternative forms
*priceyness
Noun
(-)
The quality of being pricy, that is, expensive.
Synonyms
*(quality of being pricy) expensiveness, costliness