extravagant vs extravagance

extravagant is not a noun while extravagance is a noun.

Word	Noun	Adjective	Verb	Adverb
extravagant	No	Yes	No	No
extravagance	Yes	No	No	No

extravagant (noun)	extravagance (noun)
	the activity of excessive spending
	the trait of spending extravagantly
	the quality of exceeding the appropriate limits of decorum or probability or truth

extravagant (adjective)	extravagance (adjective)
unrestrained, especially with regard to feelings
recklessly wasteful