IPA: //ˈbækˌsplæʃ//
KK: /ˈbækˌsplæʃ/
A vertical surface, often made of tiles, that is placed behind a sink or stove to protect the wall from water, heat, and stains.
The kitchen looks great with the new tile backsplash behind the stove.
Backsplash → The word is formed from "back" (from Old English "bæc", meaning the rear or behind) and "splash" (from Middle English "splashen", meaning to scatter or spatter liquid). A backsplash refers to a surface at the back of a sink or stove that protects the wall from water and splashes.
Think of the 'back' of a sink or stove where water 'splashes' — that's why a backsplash is there to protect the wall.
No commonly confused words.