The term 'IT RUNS ON RUNNERS' can be solved by two crossword solutions: SLED (4 letters) and SLEIGH (6 letters). A SLED is a vehicle that is typically used for recreational purposes, such as sledding or tobogganing. It is usually made of plastic or wood and is pulled by a person or animal. A SLEIGH is a type of vehicle that is pulled by horses or other animals. It is usually used for transportation or recreational activities, such as SLEIGH rides.