And just to add to the confusion over ship designations, some cultures (like the old Soviet Navy) might use function-based designations that owe little or nothing to the traditional names for ship types.
The Soviets used (for the most part) functional designations like Rocket Cruiser, or Large Anti-Submarine Ship, or Aviation Cruiser. I tend to do something like this myself when designing HG fleets: I have Meson Battleships, Missile Cruiser Riders, Beam Corvettes, etc, etc. A class designation is a combination of main weaponry type plus a size class name, plus Rider if a non-jump big craft.
For weapons I use:
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- Meson - armed with a spinal meson gun, or lots of meson gun bays.</font>
- Particle - spinal particle accelerator, or lots of particle accelerator bays or turrets.</font>
- Missile - No spinal mount and lots (minimum of 50% of all secondaries) of missile bays or turrets.</font>
- Beam - No spinal mount, lots (again, minimum of 50% of all secondaries) of energy weapon bays, turrets, or laser turrets.</font>
- Fighter - May have a spinal mount and/or other weapons, but carries a lot (at least 20% of total tonnage is carried craft) of fighters.</font>
- Rider - May have a spinal mount and/or other weapons, but mainly carries riders (at least 20% of total tonnage is carried craft).</font>
For size classes I use the traditional names with these tonnage ranges:
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- Battleship/Dreadnought - 200,000 dtons and up.</font>
- Battlecruiser - 100,000 to 200,000 dtons.</font>
- Heavy Cruiser - 50,000 to 100,000 dtons.</font>
- Light Cruiser - 20,000 to 50,000 dtons.</font>
- Destroyer Leader - 10,000 to 20,000 dtons.</font>
- Destroyer - 3,000 to 10,000 dtons.</font>
- Destroyer Escort - 1,000 to 3,000 dtons.</font>
- Frigate - 600 to 1,000 dtons.</font>
- Corvette - 300 to 600 dtons.</font>
- Scout - 100 to 300 dtons.</font>
- Fighter - less than 100 dtons.</font>
There is of course some overlap in the size ranges.
Then I add either Carrier if the ship carries lots of Fighters, or Tender if the ship carries Riders. If a ship is designed so that carrying other vessels is its main function, I usually won't put a "weapon" designation on it except for "Fighter" or "Rider" as appropriate. Also, Rider Tenders get a size designation based on the size of Rider they carry, not based on their own size.
So I might have a 300,000 dton Destroyer Rider Tender that ferries 10,000 dton Meson Destroyer Riders and is protected by a flock of 2,000 dton Beam Destroyer Escorts. Or I might have a 100,000 dton Particle Battlecruiser as the core of a raiding force that has some 20,000 dton Missile Light Cruisers.
Auxiliaries (assault transports, tankers, repair ships) don't fall under this nomenclature.