schnorkel vs breather

schnorkel and breather both are nouns.

Word	Noun	Adjective	Verb	Adverb
schnorkel	Yes	No	No	No
breather	Yes	No	No	No

As nouns, schnorkel and breather are synonyms defined as:

schnorkel and breather: air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time

Other synonyms of schnorkel include schnorchel, snorkel, snorkel breather.

schnorkel (noun)	breather (noun)
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time	air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
	a short respite