lavishness vs high life

lavishness and high life both are nouns.

Word	Noun	Adjective	Verb	Adverb
lavishness	Yes	No	No	No
high life	Yes	No	No	No

As nouns, lavishness and high life are synonyms defined as:

Other synonyms of lavishness include extravagance, highlife, prodigality.

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