Spelljammer Classes

Spelljammers come in many sizes and designs. While each ship is fundamentally unique, there are a few broad classifications created to simply nomenclature.
Warships by size, descending size and crew compliment:

• Dreadnaught, theoretical limit to the size of warships, none known to exist
• Battlestandard (also known as an Admiral Ship or High Capital Ship)
• Battlecruiser (also known as Capital Ship)
• Heavy Cruiser (illithid Nautiloids are generally considered comparable to this class)
• Light Cruiser
• Destroyer
• Frigate
• Corvette
• Monitor
• Fighter (also caller Fast Attack Ship), *pictured*

Warships by function:

• Prime Combatant: Heavily armed and armored. Typically a destroyer or heavier ship.
• Carrier: Heavily armored with pace to carry smaller ships. Typically a heavy cruiser or heavier ship.
• Lander: Ease of landing and returning to space prioritized in the design. Often a troop transport. Usually a frigate or corvette.
• Patroller: Endurance and detection prioritized. Typically carry extra wizards. Usually a light cruiser down to a patron.
• Logistical: Lightly armed and armored. Used to move troops and supplies. May support the heavier ships in a fleet. Often frigates.
• Emplacement Defense: Slower ships with heavy weapons and armor, typically to act as guards or defense to a location.

Non-Warships by size, descending size and crew compliment:

• Ivory Dragon, a single ship in its own class. Minimum crew in the 100s.
• Carrack, any ship with four masts and complex fore rigging. Bare minimum crew of 32.
• Barque, three or more masts with fore and aft rigging. Bare minimum crew of 24.
• Barquentine, three masts and fore rigging only. Bare minimum crew of 21.
• Brig, two masts ship with fore and aft rigging. Bare minimum crew of 18.
• Brigantine, two masts with fore rigging only. Bare minimum crew of 15.
• Caravel, two masts only. Bare minimum crew of 12.
• Schooner, one mast with fore and aft rigging. Bare minimum crew of 12.
• Settee, one mast and minimal rigging. Bare minimum crew of 9.
• Pram, minimally sized. Bare minimums vary down to 1.

Non-Warships by function:

• Merchant or Merchantman: Mobile shops. Carry trade goods and their owners to potential markets. Often a great way to book personal transport on short notice.
• Cargo: A ship primarily designed to haul heavy loads of goods quickly.
• Aviso: Dispatch and messenger ships. Built for speed.
• Yacht: Personal recreational craft. Typically smaller than brigs.
• Collier: A single product transporter. Often little more than a warehouse and a couple of rooms for the crew.
• Transport: Small sized ship intended for the transport of minimal passengers. 
• Cruise Ship: Medium sized ship intended for comfortable transport of passengers. Generally holds 50 to 250 passengers. 
• Star-Liner: Large sized ship intended for comfortable transport of passengers. Generally holds 250 to 2000, it is difficult to make ships large enough for more. 
• Galleon: Any non-military ship equipped for combat. Often jury-rigged. Most pirate vessels are classified as galleons.
• Mistico: A simplified ship not equipped for interstellar distances.
• Slaver: A ship optimized for the transport of sentient cargo. The interiors of Illithid Nautiloids are suspiciously similar to this ship class. 
• Steamer: A newer class of ship, currently clunky and unwieldy. Despite the rumors, it is actually gnome technology improving the speed of a functioning spelljammer helm.