Traveler and traveller are both English terms. Traveler is predominantly used in ???? American (US) English ( en-US ) while traveller is predominantly used in ???? British English (used in UK/AU/NZ) ( en-GB ).
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Both Rom and Romani have been in use in English since the 19th century as an alternative for Gypsy. Romani was sometimes spelled Rommany, but more often Romany, while today Romani is the most popular spelling.