The term 'Kind of Football' can be answered by two crossword solutions: ARENA (5 letters) and Nerf (4 letters). ARENA football is a type of indoor American football that is played on a smaller field than traditional outdoor football. It is played with eight players on each team, and the field is surrounded by walls and nets. Nerf football is a type of soft foam ball used for recreational play. It is often used in backyard games and is much safer than traditional footballs.