ROGET THESAURUS
quadratic
Four
N
quaternity, four, tetrad, quartet, quaternion, square, quarter, tetract, tetragon, quadrangle, rectangle, tetrahedron, quadrature, quadrifoil, quadriform, quadruplet, quatrefoil, tetrapod, quadrangle, quad, quadrupole, quadrivium, four, quaternary, quaternal,
quadratic, quartile, tetract, tetractic, tetractinal, tetrad, tetragonal, square, quadrate.