Codex:M

Mainmast
The second mast from forward on any two-mast ship; the larger forward mast on vessels such as ketches; the sole mast on vessels such as sloops or cutters. 

Mast
A spar or structure rising above a ship's hull to hold sails, spars, rigging, booms etc. Ships commonly carry a foremast or mainmast. 

Mate
Also matey: Term commonly given to any officer or sailor below the captain of a ship. Also used to refer to the First Mate. 

Mutiny
"The deepest circle of hell is reserved for betrayers and mutineers."

- Jack Sparrow to Koehler and Twigg

A revolt or rebellion against constituted authority; particuarly a sailors' revolt against the captain or officers of a ship. Hector Barbossa led a mutiny against Jack Sparrow aboard the Black Pearl.