IPA: //ˈfoʊtəˌflæʃ//
KK: /ˈfoʊtəˌflæʃ/
A device that produces a bright light for a very short time, typically used in photography to illuminate a scene or subject.
The photographer used a photoflash to capture the perfect moment in low light.
Photoflash is formed from "photo-" (from Greek "phōs", meaning light) and "flash" (from Old English "flaesc", meaning to shine or emit light suddenly). The word "photoflash" refers to a sudden burst of light, typically used in photography.
Think of 'light' ('photo-') that 'shines suddenly' ('flash') — that's what a photoflash does.
No commonly confused words.