Gunmetal-grey is a popular shade of grey that is often associated with metallic objects such as weapons or machinery. However, if you're looking for some alternative names to describe this color, here are a few suggestions. You can use terms like charcoal, steel grey, and slate grey to describe a similar shade. On the lighter side, you can use the term ash grey or smoke grey to describe a lighter version of this hue. For a darker tone, granite or storm grey might be more appropriate. Whichever synonym you choose, remember that this color will always invoke a sense of strength and resilience.