extravagance vs extravagant

extravagance is a noun but extravagant is not a noun.

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

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

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