IPA: //ˈæftərˌdɛk//
KK: /ˈæftərˌdɛk/
A section of a ship's deck located towards the back, behind the middle part of the vessel.
The crew gathered on the afterdeck to discuss the next steps of the voyage.
Afterdeck → The word is formed from "after" (from Old English "æfter", meaning behind or later) and "deck" (from Old Norse "dekk", meaning covering or surface). The term "afterdeck" refers to the part of a ship's deck that is located towards the rear or back of the vessel.
Think of being 'behind' ('after') on the 'surface' ('deck') of a ship — that's why afterdeck refers to the back part of the ship's deck.
No commonly confused words.