petard /pe-tär or -tärdˈ/

1. A case containing an explosive, used for blowing in doors, etc (Shakespeare petarˈ)
2. A moving firework

hoist with one's own petard see under hoist

• spark coils
• sparke
• sparked
• sparked-out
• sparkes
• spark gap
• spark gaps
• sparkie
• sparkier
• sparkiest
• sparking
• sparking-plug
• sparking-plugs
• sparkish
• sparkishly
• sparkle
• scourgers
• scourges
• scourging
• scourie
• scouring
• scouring rush
• scouring-rush
• scouring rushes
• scourings