spaceman(n = noun.person) astronaut, cosmonaut - a person trained to travel in a spacecraft; "the Russians called their astronauts cosmonauts"
is a kind of traveler, traveller
has particulars: spacewalker, armstrong, neil armstrong, gagarin, yuri alekseyevich gagarin, yuri gagarin, glenn, john glenn, john herschel glenn jr., alan bartlett shepard jr., alan shepard, shepard, tereshkova, valentina tereshkova, valentina vladmirovna tereshkova

1.  an astronaut. [PJC]

2.  an intelligent creature from outer space; an extraterrestrial; -- a fictional or hypothetical being, never actually observed. [PJC]

spaceman, n. (pl. -men; fem. spacewoman, pl. -women) = space traveller.