lavishness vs sumptuosity

lavishness and sumptuosity both are nouns.

Word	Noun	Adjective	Verb	Adverb
lavishness	Yes	No	No	No
sumptuosity	Yes	No	No	No

As nouns, lavishness and sumptuosity are synonyms defined as:

lavishness and sumptuosity: the quality possessed by something that is excessively expensive

Other synonyms of lavishness include luxury, sumptuousness.

lavishness (noun)	sumptuosity (noun)
the activity of excessive spending	the quality possessed by something that is excessively expensive
the quality possessed by something that is excessively expensive