WordNet sense 1 (a group of seven bright stars in the constellation Ursa Major):

dipper, plough, wain, Big Dipper, Charles's Wain

WordNet sense 2 (a child's four-wheeled toy cart sometimes used for coasting):

coaster wagon

WordNet sense 3 (any of various kinds of wheeled vehicles drawn by a horse or tractor):

waggon

WordNet sense 4 (van used by police to transport prisoners):

police van, black Maria, paddy wagon, patrol wagon, police wagon

WordNet sense 5 (a car that has a long body and rear door with space behind rear seat):

beach wagon, beach waggon, station waggon, station wagon