The term 'bluish-gray color' can be summarized by the crossword solution of 'STEEL, ' which is a five letter word. STEEL is an alloy of iron and carbon, and is known for its strength and durability. It is often used in construction and manufacturing, and is also a popular choice for jewelry and other decorative items. The color of STEEL is a bluish-gray hue, which is why it is a fitting solution for this crossword puzzle.