Carouser - A person who drinks and engages in festivity, especially riotous drinking (Intermediate)

Case Shot - A collection of small projectiles put in cased to fire from a cannon (Intermediate)

Cat o' Nine Tails/Cat - A whip with nine lashes used for flogging "A taste of the cat" means a full flogging, a single blow to "smarten up" a clumsy hand (Master)

Chain Shot - Two cannonballs chained together and aimed high in order to destroy masts and rigging (Intermediate)

Chantey/Chanty/Shantey/Shanty - A song sung by sailors to the rhythm of their movements while working (Noob)

Chase - A ship being pursued (Noob)

Chase Guns - Cannons situated at the bow of a ship, used during pursuit (Noob)

Clap o' Thunder - A strong alcohol; In my stories, I pretend it's milk (NOOB)

Clipper - A fast moving ship (Noob)

Code of Conduct - A set of rules which governs pirates behavior on a vessel/ship (NOOB)

Coffer - A chest in which treasure is usually kept in (NOOB)

Cog - A small warship (Noob)

Come About - To bring the ship full way around in the wind. Used in general while sailing into the wind, but also used to indicate a swing back into the enemy in combat (Intermediate)

Crack Jennys tea cup - To spend the night in a house of ill repute (Intermediate)

Cutlass - A short, heavy sword with a curved blade used by pirates and sailors, the sword has only one cutting edge and may or may not have a useful point (NOOB)