ventilator vs breathing machine

ventilator and breathing machine both are nouns.

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

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

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

Other synonyms of ventilator include breathing apparatus, breathing device.

ventilator (noun)	breathing machine (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