aviator vs aeronaut

aviator and aeronaut both are nouns.

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

As nouns, aviator and aeronaut are synonyms defined as:

Other synonyms of aviator include flier, flyer.

aviator (noun)	aeronaut (noun)
someone who operates an aircraft	someone who operates an aircraft