The words that can be used as synonyms of the word "most quadratical" are mathematical, geometric, rectangular, four-sided, square, and equilateral. These words pertain to rectangular shapes or figures that have equal sides or angles. The word "rectangular" refers to any shape that has a right angle or a corner that forms a 90-degree angle, while "square" and "equilateral" both refer to figures that have four equal sides and angles. "Geometric" and "mathematical" are broader terms that refer to any pattern or shape that can be described and analyzed using mathematical principles.