Prow : Fore :: Stern : Aft
Here's why:
* Prow refers to the front of a ship.
* Fore is a general term for the front of something, including a ship.
* Stern refers to the rear of a ship.
* Aft is a general term for the rear of something, including a ship.
So, the analogy shows the relationship between specific terms for the front and rear of a ship and their general counterparts.