Couch - Sofa to you. America has some of the largest furniture in the world, yet the only sofa too small to make love in, you call a Love Seat!
Duvet - Most Brits have dispensed with blankets and sheets and now sleep under a duvet. It is similar to a comforter but has a removable cover that can be washed. Duvet's warmth is measured in togs, 2 or 3 togs for summer duvets and 11 or more for winter ones.
Earth - This, in electrical terms is what you call ground. You will find appliances that say "this appliance must be earthed" for example. Or when wiring an electrical plug the third pin will be marked "earth".
Loft - Our loft is your attic.