aeronaut vs aviator

aeronaut and aviator both are nouns.

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

As nouns, aeronaut and aviator are synonyms defined as:

Other synonyms of aeronaut include flier, flyer.

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