Cerulean and Cobalt

Cerulean adjective - Deep blue like the color of a clear October sky.

Cobalt and cerulean are semantically related in sky topic. In some cases you can use "Cobalt" instead an adjective "Cerulean".

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

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