| Term | Definition |
| when a whale leaps almost completely out of the water and flaps back down | breach |
| flat part of a whales tail | fluke |
| when a whale slaps its fluke on the surface of the water | lobtail |
| fin on the back of the whale | dorsal fin |
| front of boat | bow |
| back of boat | stern |
| a sail set on a rope | staysail |
| to secure a rope by winding it around something | belay |
| a platform used as a look out | crowsnest |
| a rope used to raise and lower sail | halyard |
| a boat with one sail | sloop |
| a rope used to gather a sail not in use | furling line |