What is it called when you have a phobia of substitute teachers?

There isn't an officially recognized phobia specifically for substitute teachers. Phobias are usually named using the Greek root for the feared object or situation. While you could *describe* a fear of substitute teachers, there's no established clinical term for it. The fear would likely fall under a broader category like school phobia or potentially social anxiety disorder if the fear stems from interaction with an unfamiliar authority figure.