affluenza vs inability

affluenza and inability both are nouns.

Word	Noun	Adjective	Verb	Adverb
affluenza	Yes	No	No	No
inability	Yes	No	No	No

As nouns, inability is a hypernym of affluenza; that is, inability is a word with a broader meaning than affluenza:

affluenza: an inability to understand the consequences of one's actions because of financial privilege
inability: lack of ability (especially mental ability) to do something

affluenza (noun)	inability (noun)
an inability to understand the consequences of one's actions because of financial privilege	lacking the power to perform
	lack of ability (especially mental ability) to do something