S: (n) line (a formation of people or things one behind another) "the line stretched clear around the corner"; "you must wait in a long line at the checkout counter"
S: (n) formation (an arrangement of people or things acting as a unit) "a defensive formation"; "a formation of planes"
S: (n) arrangement (an orderly grouping (of things or persons) considered as a unit; the result of arranging) "a flower arrangement"