Blue-sky and Blue sky

Blue-sky adjective - Without immediate commercial value.

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

Blue sky noun - The sky as viewed during daylight.

Blue-sky and blue sky are semantically related in deceptive topic. Sometimes you can use "Blue-sky" instead an adjective phrase "Blue sky", if it concerns topics such as creative, illusive.