Nouns

(n)snorkelbreathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface; allows swimmer to breathe while face down in the water
(n)snorkel, schnorkel, schnorchel, snorkel breather, breatherair passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time

Verbs

(v)snorkeldive with a snorkel