ventilator vs breathing apparatus

ventilator and breathing apparatus both are nouns.

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

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

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

Other synonyms of ventilator include breathing device, breathing machine.

ventilator (noun)	breathing apparatus (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