The term 'Knish Purveyor' is a job description for a deli, which is a four letter word. A knish purveyor is someone who sells knishes, which are small pastries filled with mashed potatoes, ground meat, sauerkraut, or other fillings. Knishes are a traditional Jewish food that originated in Eastern Europe and are now popular in many countries around the world. The job of a knish purveyor is to make and sell these delicious treats.