inhalator vs breathing device

inhalator and breathing device both are nouns.

Word	Noun	Adjective	Verb	Adverb
inhalator	Yes	No	No	No
breathing device	Yes	No	No	No

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

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

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

inhalator (noun)	breathing device (noun)
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