Azure and Blue-green

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

Blue-green and azure are semantically related In some cases you can use "Blue-green" instead an adjective "Azure".

Blue-green adjective - Of a bluish shade of green.

Azure and blue-green are semantically related in sky topic. Sometimes you can use "Azure" instead an adjective phrase "Blue-green".