The viking boats were called tall ships
Small ships are usually called boats.
boats
They are called U-boats
As far as I am quite sure, there were definitely ships... and paddle boats.
U-boats, packs of German U-boats searching for American ships were called wolf packs
In their history, submarines were called by many names such as 'U-boats', 'eel boats', 'plunging boats', 'devil divers', and 'pig boats'. Technically, and by size, the submarine is a ship, but it has been called a boat since its earliest days, and the term is steeped in tradition. Submariners almost invariably call their ships 'boats".
Dredge
It is called a port
Shipwrights made boats and ships
boats lokklike
They are called "Tug boats", or simply "Tugs".