breathing machine vs breathing device

breathing machine and breathing device both are nouns.

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

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

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

Other synonyms of breathing machine include breathing apparatus, ventilator.

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