Azure and Ultramarine

Azure adjective - Of a deep somewhat purplish blue color similar to that of a clear October sky.

Ultramarine and azure are semantically related in sky-blue topic. In some cases you can use "Ultramarine" instead an adjective "Azure", when it comes to topics like sky blue. popular alternative

Ultramarine adjective - Of a brilliant pure blue to purplish blue color.

Azure and ultramarine are semantically related in sky topic. You can use "Azure" instead an adjective "Ultramarine".