ventilator vs snorkel

ventilator and snorkel both are nouns.

Word	Noun	Adjective	Verb	Adverb
ventilator	Yes	No	No	No
snorkel	Yes	No	Yes	No

As nouns, snorkel is a hyponym of ventilator; that is, snorkel is a word with a more specific, narrower meaning than ventilator:

ventilator: a device that facilitates breathing in cases of respiratory failure
snorkel: 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

Other hyponyms of ventilator include Aqua-Lung, aqualung, scuba, oxygen mask, inhalator, respirator, resuscitator.

ventilator (noun)	snorkel (noun)
a device (such as a fan) that introduces fresh air or expels foul air	air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
a device that facilitates breathing in cases of respiratory failure	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

ventilator (verb)	snorkel (verb)
	dive with a snorkel