decklid

From deck +‎ lid.

decklid (plural decklids)

1. An auto body panel that is the cover over the trunk (boot) of a motor vehicle.
   • 2007 November 25, Don Sherman, “Rust-Free Reality: Creating an All-New Classic”, in New York Times‎^[1]:

     For maximum corrosion resistance, the company builds its doors, hoods and decklids of galvanized steel.

• trunklid

• bonnet, hood (the cover over the engine bay)
• parcel shelf (likewise covering the trunk, but inside the cabin)