OK here are the current classes for NAVYs real world History that I know of in order of size and importance, I have included typical weight of the ships in tonnes to give an basic idea of size. Combat Classes BB - Battleship 45,000 CV - Carrier 27,000 CVL- Carrier, Light 11,000 CVE- Carrier, Escort11,000 CB - Battle Cruiser 27,500 CA - Heavy Cruiser 13,600 CL - Light Cruiser 10,000 CL - Anti-Air Cruiser 6,000 DD - Destroyer 2,400 DE - Destroyer Escort 1,400 SS - Submarine 1,525 PF - Frigate 1,430 PG - Corvette 1,000 PC - Patrol Craft 284 SC - Sub Chaser 98 PT - Patrol Torpedo Boat 45 Support Ships AD - Destroyer tender AO - Oiler LCx - Landing Craft AE - Ammunition, explosives ship AP - Personnel or troop transport LSx - Landing Ship AF - Provisions ship ARx - Repair ships LVx - Landing Vehicle AG - Miscellaneous auxiliary ships AS - Submarine Tenders WPx - Coast Guard Cutters AH - Hospital ship ATx - Tugboats AK - Cargo ship AV - Seaplane Tender AM - Mine sweepers Tell me if I missed any, as you can see there is a big gap between Destroyers and Battleships in the Star Wars universe. It seems that SSDs would be the Battleships\Carriers of the SW universe. And you can see that if a Mon-Calamari is a Cruiser then the makers of these ships were not told what they were up against when the designated them. Maybe they wanted to scare the Imperials LOL as a Destroyer in the Imperial NAVY is just as large as a BattleCruiser in the Rebel NAVY. For the Starwars Universe in the case of the SD and Mon-Cals Carrier must be added to the designation whatever they actually are. Obviously the Submarine and their Tenders cannot be transfered to the Star Wars universe but may be special ships capable of travelling through specific gas populated star systems like water for space but gas - did that make sense. Also atmosphere capable and non-atmosphere capable vessels complicate things further. I assume a lot of worlds have non-standard atmospheres making it hard to say what ships would fly in what atmospheres. P.S. I was talking about the last HOOD the BattleCruiser that got smashed by the German NAVY. This Battlecruiser was certainly as well armed as a battleship but lacked the armour for a stand up fight. The idea of a cruiser is to have a ships that is fast enough to run from those that are just as well armed and well armed enough to kill anything that can catch it. Specifically used for commerce raiding. These were a failure in ww2 as they were hunted and held by the smaller ships while the bigger Battleships caught up and hammered them OR as in ww1 they took their place in the battle line at Jutland and suffered a hammering because of their lack of armour. Basically they look like battleships as they are the same size (although most are much sleeker) but lack the armour to make them faster. Offcourse by the nature of a converted mon-cal liner this could not be helped. But why Cruiser?? Or why Destroyer? Is Star Destroyer just a name? And a feared one at that