breather vs schnorkel

breather and schnorkel both are nouns.

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

As nouns, breather and schnorkel are synonyms defined as:

breather and schnorkel: 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 breather include schnorchel, snorkel, snorkel breather.

breather (noun)	schnorkel (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