The Collaborative International Dictionary of English v.0.48:

Aeronaut \A"["e]r*o*naut\ (?; 277), n. [F. a['e]ronaute, fr. Gr.
   ? air + ? sailor. See Nautical.]
   An a["e]rial navigator; a balloonist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aeronaut
    n 1: someone who operates an aircraft [syn: aviator,
         aeronaut, airman, flier, flyer]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "aeronaut":
   aeroplaner, aeroplanist, air pilot, airplanist, astronaut, aviator,
   barnstormer, birdman, captain, cloud seeder, commercial pilot,
   copilot, crop-duster, flier, instructor, jet jockey,
   licensed pilot, pilot, rainmaker, stunt flier, stunt man,
   test pilot, wingman