lavishness vs sumptuousness

lavishness and sumptuousness both are nouns.

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

As nouns, lavishness and sumptuousness are synonyms defined as:

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

Other synonyms of lavishness include luxury, sumptuosity.

lavishness (noun)	sumptuousness (noun)
the activity of excessive spending	the quality possessed by something that is excessively expensive
the quality possessed by something that is excessively expensive	wealth as evidenced by sumptuous living