lavishness vs luxury

lavishness and luxury both are nouns.

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

As nouns, lavishness and luxury are synonyms defined as:

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

Other synonyms of lavishness include sumptuosity, sumptuousness.

lavishness (noun)	luxury (noun)
the activity of excessive spending	something that is an indulgence rather than a necessity
the quality possessed by something that is excessively expensive	the quality possessed by something that is excessively expensive
	wealth as evidenced by sumptuous living