IPA: /ˈflæʃlaɪt/
KK: /ˈflæʃˌlaɪt/
A small, portable device that produces light, usually powered by batteries, and is used for illumination in dark places.
I took a flashlight with me when I went camping to see in the dark.
Flashlight → It is formed from "flash" (from Middle English *flaschen*, meaning to emit light suddenly) and "light" (from Old English *leoht*, meaning illumination). The word "flashlight" refers to a device that emits a sudden beam of light.
Think of a device that emits a sudden burst of light — that's what a flashlight does, combining the idea of 'flashing' light with the concept of 'illumination'.
No commonly confused words.