A drabble is a short work of fiction of precisely one hundred words in length. The purpose of the drabble is brevity, testing the author's ability to express interesting and meaningful ideas in a confined space.
How long are Drabbles supposed to be?
Traditionally, a drabble is a piece of fiction that is exactly 100 words long.
What is a 500 word fic called?
When discussing fic under 500 words that is not exactly 100 words, the term you want is flash fiction. Or even flashfic, or minute fic, or sudden fic, postcard fic, fast fic, quick fic, and a few others. Flashfic is the most common and well-known, but there are a few alternatives.