• Ghost ships, unlike all others, have an automatic bonus of 15% rather than a bonus paid daily overtime
• Your entire purchase (400K GTs) + bonus (60K GTs) will be instantly converted to Gold Coins
• Ghost ships have a life of 160 days to earn Pirate pool rewards but cannot be rebuilt
• When you level up a ghost ship, your GTs convert to Gold Coins as well with the 15% bonus
• You can sell and replace a ghost ship at anytime with no loss other than Naval Power for Pool rewards
• Ghost ships have more Naval Power than all ships and do have 90% bonus NP if you are in “Pool” Mode

Dinghy – small sailing boat less than 15 feet long occupied by 1 or 2 individuals for fishing or as a lifeboat.  

Sloop – Many pirates favored smaller ships such as sloops. These ships, though small, gave pirates the speed they needed to catch merchant ships and required. They carried about 75 men and held about 8 to 12 cannons. They had a single mast with a fore and aft rig, and had at least one jib. Sloops are infamous for being fast ships that control well even without the wind. Due to their size, they could sail through shallow waters with little risk of being damaged. Merchants often used these ships in an attempt to get away from pirates. However, considering many were after this ship type, they only succeeded in attracting them.

Junk – It is believed that the word Junk came from the Malay-Javanese word jung or ajung, which could have been derived from the Chinese word jung meaning “floating house”. They originated from China in the 2nd Century AD, and were used in trading. They are fast vessels that can be easily controlled and were able to make long journeys. Historically, there were quite a few Chinese pirates, and it is very likely that they used these ships.

Schooner – Perhaps the best known ship, the Schooner is a little of all of the best features in a pirate ship. Unique to the Schooner is a very narrow hull and shallow draft. The pirates of the North American coast and Caribbean were partial to the Schooner because, for a 100 ton ship loaded with 8 cannons, 75 pirates, and 4 swivel guns, it was still small enough to navigate the shoal waters and to hide in remote coves. The Schooner could also reach 11 knots in a good wind. In short, it was a small, quick, and sturdy work-horse for gentlemen of fortune. The first schooner was being launched at Gloucester, Massachusetts, about 1713.

Barque or Bark –  Bark (or Barque) were light and fast ships with a shallow draft. Because of its small size and a specific design, the pirates favored and often used bark. It usually carried at least three masts. They were all rigged with the square sails, except on the mizzen-mast, which was rigged with the fore-and-aft sails. This type of ship was the most popular in the 19th century. An average capacity of a bark was 500 tons and she could carry up to 100 men.

Corvette – The term corvette seems to have begun with the French Navy in the 1670s, to describe a small, maneuverable, lightly armed warship, smaller than a frigate and larger than sloops-of-war. Most sloops and corvettes of the late 17th century were around 40 to 60 feet in length. They carried four to eight small guns on a single deck. These early corvettes grew quickly in size over the decades, and by the 1780s they reached lengths of over 100 feet. Most of these large versions had three masts, and carried about 20 guns.

Frigate – Around 1700, the English limited the word to mean a class of warship which was only second in size to the Ship-of-the-Line (Man-O-War). Frigates were three-masted with a raised forecastle and quarterdeck. They had anywhere from 24 to 38 guns, and were faster than the ship-of-the-lines. Frigates were used for escort purposes, and sometimes to hunt pirates. Only a few pirates were ever in command of a frigate as most would flee at the sight of one.

Galleon  – Galleons were often described as “sluggish” and “difficult to sail”, but changes to their structure and rigging soon made them easier to handle. They usually carried a large crew that went up to 400 men, and carried 70 to 100 cannons. When the Spanish sailed these ships, they were often armed with very few cannons, but carried long-range powerful weapons that made them hard to approach.

Ship of the line (Man of War) – These ships were the “heavy-guns” of the naval fleet. At first they resembled galleons in design, but carried awesome firepower with an average of 60 guns. Over the course of time, they developed into larger and heavier beasts. They were designed to be large enough for use in line of battle tactics, hence there name. Most were around 1,000 tons and had 3 masts, which were square-rigged, except for a lateen sail on her aft-mast. Only the three major sea-powers of the time (Spain, England, and France) had an extensive use of these ships.

Sources:
http://www.thewayofthepirates.com/pirate-ships-types/bark/
https://aminoapps.com/c/pirates-of-the-caribbean/page/blog/what-types-of-ships-did-pirates-really-sail/z6BG_Y8atxuY26X6Z6mE2bGRVqmJZ4Pb70j