astronaut (n.)

• adventurer
• aeronaut
• alien
• alpinist
• aviator
• barnstormer
• camper
• captain
• climber
• commuter
• copilot
• cosmonaut
• cosmopolite
• cruiser
• excursionist
• explorer
• fare
• flier
• goer
• hajji
• instructor
• journeyer
• mariner
• mountaineer
• palmer
• passenger
• passerby
• pathfinder
• pilgrim
• pilot
• pioneer
• rainmaker
• rubberneck
• rubbernecker
• sailor
• sightseer
• spaceman
• straphanger
• tourer
• tourist
• trailblazer
• transient
• traveler
• trekker
• tripper
• viator
• voyager
• wayfarer
• wingman