dock, port
prow
sail
A quay is a platform built parallel to the shore where ships can tie up to. A pier is another four letter word where a ship can dock.
hut
Hut
arbor
Sanctuary
A four letter word starting with the letter a is able.
arbor
den
It is of French origin meaning 'a place to shelter a car'. Derives from the word 'garer' meaning to shelter and also dock ships. Garage came into use about 1902
A four letter word for 'in addition to' is also.