From Longman Business Dictionary
travellertrav·el·ler /ˈtrævələ-lər/ British EnglishBrE, traveler American EnglishAmE noun [countableC] TRAVELsomeone who travels from one place to another, or to several different places by air, road, rail etcThe most important thing for abusiness traveller is to get there on time.
→ commercial traveller