Privateer.
Privateers
Letter of Marque
Privateer
Other way around: A blockade tries to prevent enemy ships from passing
Mainly u-boats, other enemy ships and enemy bombers
Ironclads could destroy wooden enemy ships using either cannon fire or by ramming them.
Yes there were civilian passenger ships that traveled across the Atlantic Ocean during World War 2. Unfortunately during this time there were many civilian passenger ships that never reached their destinations due to disaster striking during their sail.
A merchant vessel outfitted to fight is commonly referred to as a "privateer." These ships were typically merchant ships that were armed and authorized by a government to engage in warfare, particularly against enemy vessels. Privateers operated during times of conflict, capturing enemy ships and cargo, and were often motivated by profit, as they could keep the spoils of their captures. This practice was a legal form of piracy sanctioned by letters of marque issued by governments.
Such a ship is called a privateer, like a pirate ship except that it holds a license to attack enemy ships.
No
ships were important as if the enemy is by the sea they can attack with the element of surprise.
SS is short for Steam Ship and used on civilian ships. NS would be Nuclear Ship and there was at least one civilian nuclear powered vessel. US Navy ships carry the prefix of USS for United States Ship. British Navy ships have HMS for Her Majesty's Ship.