Nouns

(n)turtleneck, turtle, polo-necka sweater or jersey with a high close-fitting collar
(n)turtleany of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming

Verbs

(v)capsize, turtle, turn turtleoverturn accidentally“Don't rock the boat or it will capsize!”
(v)turtlehunt for turtles, especially as an occupation