Little Joe, biquadrate, biquadratic, four-legged, four-part diaphony, four-rayed, four, foursome, foursquare, quad, quadrangle, quadrature, quadrennium, quadric, quadrilateral, quadrille, quadrinomial, quadrivalent, quadruped, quadruplet, quartet, quartic, quartile, quatern, quaternion, quaternity, quatrefoil, rectangle, square, square dance, squaring, tetractinal, tetrad, tetragon, tetragram, tetragrammaton, tetrahedron, tetralogy, tetraphony, tetrapody, tetravalent