The Potions Professor at Hogwarts is Severus Snape, a 5 letter name. He is a half-blood wizard who was a Death Eater before joining the Order of the Phoenix. He is known for his cold and sarcastic attitude, but he is also a loyal friend and mentor to Harry Potter. Snape is a master of potions and is highly respected by his peers. He is also a skilled Occlumens and Legilimens, making him a powerful wizard.