traveler vs flier

Other hyponyms of traveler include absentee, air traveler, air traveller, arrival, arriver, comer, astronaut, cosmonaut, spaceman, business traveler, bearer, carrier, toter, companion, fellow traveler, fellow traveller, entrant, flyer, follower, alien, foreigner, noncitizen, outlander, hosteller, courier, messenger, migrant, migrator, motorcyclist, mover, musher, passenger, rider, footer, pedestrian, walker, rafter, raftman, raftsman, rider, rider, runner, scourer, bather, natator, swimmer, holidaymaker, tourer, tourist, transient, trekker, visitant, visitor, voyager, bird of passage, roamer, rover, wanderer, journeyer, wayfarer.