aviator vs airman

aviator and airman both are nouns.

Word	Noun	Adjective	Verb	Adverb
aviator	Yes	No	No	No
airman	Yes	No	No	No

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

Other hyponyms of aviator include airwoman, aviatress, aviatrix, airplane pilot, pilot.

aviator (noun)	airman (noun)
someone who operates an aircraft	a male who operates an aircraft