Next thing you know, the Avaricious will move in and ruin the neighborhood.

Student: Avaricious is the noun of avarice, right?

Me: Avarice is the noun.

Student: Then what is avaricious?

Me: Something that you just made up.

Student: No, it's a word.

Me: Yeah, it is a word. It's an adjective.

Student: Adjectives are words too. Don't be racist.