a square is a special rectangle
equalateral rectangle
The plane square is a special form of diamond, kite, parallelogram, polygon, quadrilateral, rectangle, rhombus or trapezoid. You could add: tetragon.
radical
You can say " tetragon " but it's used and for any other 4 angles figure!
Visit the Kremlin in Moscow, Russia
Simon Cowell's Replacement on American Idol
Kick Ass Red Band Trailer Reactions
People's Reaction to Tiger Woods' Nike Ad