-naut

-naut

suff.
1. Voyager, traveler: hydronaut.
2. One likened to a voyager: cybernaut.

[From Greek nautēs, sailor, from naus, ship; see nāu- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-naut

n combining form
indicating a person engaged in the navigation of a vehicle, esp one used for scientific investigation: astronaut.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014