respire vs respirator

respire is not a noun while respirator is a noun.

Word	Noun	Adjective	Verb	Adverb
respire	No	No	Yes	No
respirator	Yes	No	No	No

respire (noun)	respirator (noun)
	a breathing device for administering long-term artificial respiration
	a protective mask with a filter; protects the face and lungs against poisonous gases

respire (verb)	respirator (verb)
draw air into, and expel out of, the lungs
undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide
breathe easily again, as after exertion or anxiety