ventilator vs device

ventilator and device both are nouns.

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

As nouns, device is a hypernym of ventilator; that is, device is a word with a broader meaning than ventilator:

ventilator: a device (such as a fan) that introduces fresh air or expels foul air
device: an instrumentality invented for a particular purpose

As nouns, device is a hypernym of ventilator; that is, device is a word with a broader meaning than ventilator:

ventilator: a device that facilitates breathing in cases of respiratory failure
device: an instrumentality invented for a particular purpose

ventilator (noun)	device (noun)
a device (such as a fan) that introduces fresh air or expels foul air	any clever maneuver
a device that facilitates breathing in cases of respiratory failure	an instrumentality invented for a particular purpose
	an emblematic design (especially in heraldry)
	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect