Gun-metal grey is a distinctive shade of dark grey that resembles the color of polished metal. While the term gun-metal grey is often associated with firearms, it has also become a popular shade in fashion and design. If you're looking for alternative synonyms to describe this color, several names come to mind. Some suggestions include charcoal, slate grey, steel grey, and metallic grey. These synonyms capture the same cool, sophisticated, and modern look as gun-metal grey, making them popular choices for various applications. Ultimately, the synonym you choose will depend on your intended use, personal preference, and the context in which the color is being used.