Blue-gray and Cobalt

Blue-gray adjective - Of grey tinged with blue.

Cobalt and blue-gray are semantically related in sky topic. In some cases you can use "Cobalt" instead an adjective phrase "Blue-gray".

Cobalt noun - A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

Blue-gray and cobalt are semantically related in sky topic. You can use "Blue-gray" instead an adjective "Cobalt".