Mast tall, vertical spar which supports the sails
Boom long, horizontal spar, which connects to the mast and controls the position of the mailsail
Stern back end of the boat
Bow front end of the boat
Jib small, triangulat sail on the bow end of the mast
Mainsail

large triangular sail located on the stern end of the mast, used for steering

Tiller lever used to steer the boat
Keel rudder below the boat used to support the boat in the water, and keep it afloat
Hull the body of the boat