IPA: /ˈfaɪərwɜrk/
KK: /ˈfaɪərˌwɜrk/
A device that explodes to create colorful lights, sounds, and smoke for entertainment, often used during celebrations.
We watched the fireworks light up the night sky during the festival.
Firework is formed from "fire" (from Old English "fyr", meaning combustion or flame) and "work" (from Old English "weorc", meaning something made or a deed). The word "firework" refers to a device that produces a display of light and sound through combustion, essentially a work made with fire.
Think of 'fire' as the source of light and sound, and 'work' as something created. A firework is a creation that uses fire to produce a spectacular display.