Words written on the tombstone as an inscription are called an 

When someone passes away, their name is often written on a tombstone. But sometimes, people also add some words to the tombstone as a way to remember and honor the person who has passed. These words are called an "epitaph". It's like a short message or quote that captures something important about the person's life or personality. So when you see a tombstone with some words on it, you can refer to those words as the epitaph. In the given question, out of the given options, "epitaph" is the correct answer for the words written on the tombstone.