traveller vs trekker

Other hyponyms of traveller include absentee, air traveler, air traveller, arrival, arriver, comer, astronaut, cosmonaut, spaceman, business traveler, bearer, carrier, toter, companion, fellow traveler, fellow traveller, entrant, flier, 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, visitant, visitor, voyager, bird of passage, roamer, rover, wanderer, journeyer, wayfarer.