sumptuousness vs lavishness

sumptuousness and lavishness both are nouns.

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

As nouns, sumptuousness and lavishness are synonyms defined as:

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

Other synonyms of sumptuousness include luxury, sumptuosity.

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