fireworker
/ˈfʌɪəˌwəːkə/noun
1A person who works with fire; a blacksmith. rare.
2A person involved in the manufacture or use of military explosives; specifically an artillery officer below the rank of firemaster. Compare lieutenant-fire-worker. Now historical.
3A person who makes fireworks or who creates firework displays.
Origin
Early 17th century; earliest use found in John King (d. 1621), bishop of London. From fire + worker.