If you can use it (I didn’t fully understand the concept until I was well into my undergraduate education), here is a Cultural Literacy worksheet on nihilism as a concept in philosophy, which is this word’s function at bottom–to dress up an abstract concept like a belief in nothing. You might want to help your students make the connection with the Latin word root nihil, which means, simply, nothing.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.