A pyromaniac; someone obsessed with setting fires

• Informal clipping of pyromaniac

Pyrotechnic effects used in concerts, shows, or sports

• Short for pyrotechnics

A pyrotechnician; a person who designs or fires effects

Pyromaniacal; having an obsessive desire to set fires

Pyrotechnic; relating to fireworks or stage effects

Pyrogallol; a photographic developing agent

• Pyrocellulose; a less-nitrated nitrocellulose