Nauts and Naught
The suffix -naut means "sailor." Thus, American astronauts are "sailers among the stars," whereas Soviet and Russian cosmonauts are "sailors among the universe." Jason's Argonauts were the sailors on his ship, the Argo. So, would the crew of Captain Nemo's Nautilus have been Nautilusnauts? Nautinauts?

Argonauts
astronauts
cosmonauts
aeronauts
psychonauts
Reaganauts

Others?