9 letters · 13 points in Scrabble
noun a person trained to travel in a spacecraft
originBorrowed from Russian космона́вт (kosmonávt), from Ancient Greek κόσμος (kósmos, “universe”) + ναύτης (naútēs, “sailor”). By surface analysis, cosmo- + -naut.
Etymology from Wiktionary, CC BY-SA 3.0