airman vs aviator

airman and aviator both are nouns.

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

As nouns, aviator is a hypernym of airman; that is, aviator is a word with a broader meaning than airman:

Other hypernyms of airman include aeronaut, flier, flyer, adult male, man.

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