snorkel

nouns

breathing 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
is a type of (narrower)
a device that facilitates breathing in cases of respiratory failure
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time

verbs

dive with a snorkel
is derived from
domain category
an active diversion requiring physical exertion and competition
is a type of (narrower)
swim under water
"the children enjoyed diving and looking for shells"