breathing machine vs breathing apparatus

breathing machine and breathing apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
breathing machine	Yes	No	No	No
breathing apparatus	Yes	No	No	No

As nouns, breathing machine and breathing apparatus are synonyms defined as:

breathing machine and breathing apparatus: a device that facilitates breathing in cases of respiratory failure

Other synonyms of breathing machine include breathing device, ventilator.

breathing machine (noun)	breathing apparatus (noun)
a device that facilitates breathing in cases of respiratory failure	a device that facilitates breathing in cases of respiratory failure