The term 'small fire starter' can be summarized by the crossword solution 'PYRO, ' which is a four-letter word. PYRO is short for pyrotechnics, which are devices used to create controlled explosions and displays of light and sound. Pyrotechnics are often used in fireworks, theatrical productions, and other special events. PYRO is also used as a slang term for someone who enjoys playing with fire or explosives.