General:
* Fleet: This is the most common and widely used term for a collection of ships.
* Squadron: A smaller group of ships, often organized for a specific task.
* Convoy: A group of ships traveling together for protection.
* Armament: This specifically refers to a group of warships.
Specific types of ships:
* Flight: A group of aircraft carriers.
* Flotilla: A group of small boats or ships.
* Galley: A group of warships in ancient Greece.
* Keelhaul: A group of sailing ships.
Other:
* Line: A group of ships arranged in a line for battle.
* Muster: A gathering of ships for inspection or review.
The best word to use will depend on the specific situation and the type of ships involved.