IPA: //ˈkaʊntərpeɪn//
KK: /ˈkaʊntərˌpeɪn/
A type of cover used on a bed, often decorative, that goes over the sheets and blankets.
She chose a beautiful counterpane to match the curtains in her bedroom.
Counterpane → It is formed from "counter-" (from Old French *contrepane*, meaning against or opposite) and "pane" (from Old French *pan*, meaning a piece or section). The word refers to a covering that is laid over a bed, often in opposition to the sheets beneath it.
Think of a covering that goes 'against' or 'over' the sheets on a bed — that's why a counterpane is a bed covering.
No commonly confused words.