炸弹

The bomb had been set with a four-hour fuse.

A bomb goes off/explodes.

unexploded bomb

mail/parcel bomb

liquid bomb

germ bomb

plastic bomb

depth bomb/charge; diving torpedo

suicide bomb(er); body bomb

gas bomb

time bomb; delayed-action bomb

conventional bomb

demolition bomb

parcel/leaflet/letter bomb

bomb crater; crater

bomb casing

set off/explode/detonate a bomb

drop/release bombs

remove an unexploded bomb

defuse/deactivate a bomb

plant a bomb