ventilator vs inhalator

ventilator and inhalator both are nouns.

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

As nouns, inhalator is a hyponym of ventilator; that is, inhalator is a word with a more specific, narrower meaning than ventilator:

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

Other hyponyms of ventilator include Aqua-Lung, aqualung, scuba, oxygen mask, respirator, resuscitator, snorkel.

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