Nah it's Kriegsschiff. That's the term the German version of the UNCLOS uses: Any marine vessel operated by any armed force of any state is a warship.
Whether it's a Kampfschiff (battleship) or Hilfsschiff (support ship) is another question. Also submarines are boats, not ships, because they have tenders.
Not to be confused with battleships which aren't war ships, the coast guard has quite a couple of those.
