ventilator vs breathing device

ventilator and breathing device both are nouns.

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

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

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

Other synonyms of ventilator include breathing apparatus, breathing machine.

ventilator (noun)	breathing device (noun)
a device (such as a fan) that introduces fresh air or expels foul air	a device that facilitates breathing in cases of respiratory failure
a device that facilitates breathing in cases of respiratory failure