YACHT - A pleasure vessel, a pleasure marine vessel; in American usage the idea of size and luxury is conveyed, either sail or power.

YANKEE - The letter Y in the Marine Radio Alphabet, also a foresail flying above and forward of the jib.

YARD - Spar attached to a mast, used to hoist sails.

YAW - To swing or steer off course, as when running with a quartering sea.

YAWL - (Dutch Jol) is a two-masted sailing vessel similar to a sloop or cutter with an additional mizzen mast aft of the main mast, usually right on the transom.