IPA: /ˈbækmoʊst/
KK: /bækˌmoʊst/
The position that is the furthest back in a group or arrangement.
The backmost seat in the theater offers a different view of the stage.
Backmost → It is formed from "back" (from Old English "bæc", meaning the rear or hind part) and "-most" (meaning the furthest or extreme). The word "backmost" refers to the position that is furthest back or at the rear.
Think of the word 'back' meaning the rear part and '-most' indicating the furthest point — so backmost means the furthest back.
No commonly confused words.