花火 (hanabi) means “fireworks” | MotiTan Japanese Dictionary

More examples

家族と花火を見ました。ka zoku to hana bi o mi ma shi ta

I watched fireworks with my family.

夜空に花火が次々と開きました。yo zora ni hana bi ga tsugi tsugi to hira ki ma shi ta

Fireworks burst one after another in the night sky.

Describes a display in which light bursts open into colorful shapes high in the sky.

火薬を使って空中に鮮やかな光や音を広げて楽しむもの。ka yaku o tsuka tte kū chū ni aza ya ka na hikari ya oto o hiro ge te tano shi mu mo no

花火 (hanabi, "fireworks") is a compound of 花 (hana, "flower") and 火 (hi, "fire"), and hi becomes bi through a sound change.

The English word fireworks can mean both the individual devices and the show they create, so the plural form is common for a whole event.