inability vs affluenza

inability and affluenza both are nouns.

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

As nouns, affluenza is a hyponym of inability; that is, affluenza is a word with a more specific, narrower meaning than inability:

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

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