inhalator vs ventilator

inhalator and ventilator both are nouns.

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

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

inhalator: a breathing device for administering long-term artificial respiration
ventilator: a device that facilitates breathing in cases of respiratory failure

Other hypernyms of inhalator include breathing apparatus, breathing device, breathing machine.

inhalator (noun)	ventilator (noun)
a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion	a device (such as a fan) that introduces fresh air or expels foul air
a breathing device for administering long-term artificial respiration	a device that facilitates breathing in cases of respiratory failure