Bilander is a nautical term that refers to a small trading vessel with two masts and square rigged sails. It originated in the 17th century and was commonly used in the coastal areas of Europe and America. Synonyms for bilander include sloop, ketch, yawl, cutter, schooner, and brigantine. A sloop is a single-masted vessel with a fore-and-aft rig, while a ketch has two masts with the mainmast taller than the mizzenmast. A yawl is a two-masted vessel with a small mizzenmast behind the rudder post. A cutter has one or more headsails, while a schooner has multiple masts and fore-and-aft sails. A brigantine has two masts with square sails on the foremast and fore-and-aft sails on the mainmast.