Question

What is the commonly term used to describe the aft-most part of a vessel?:?

Answer 1

The common term used to describe the aft-most part of a vessel is - Stern.

In naval terminology, 'Aft' is a term that means towards the stern or rear side of the ship. Tthe frame of reference is within the ship.

However, there is a difference in the stern and aft-side of the vessel. The aft is the inside (onboard) rearmost part of the vessel, while stern refers to the outside (offboard) rearmost part of the vessel.