Genius, throughout history, has been found difficult to classify because it varies in amount: It's rare to find a genius in the context of the noun, but most people, if not all, have a bit of genius in them in the context of the adjective.

Sacrifice is a noun in my vocabulary that should be a verb in my life.

What happened when the Verb asked the noun to conjugate? She said "no-no!", forgot the "o" and decided to become a nun!