Blue-sky and Way-out

Blue-sky adjective - Without immediate commercial value.

Way-out and blue-sky are semantically related. In some cases you can replace phrase "Way-out" with "Blue-sky", this phrases are similar.

Way-out adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Blue-sky and way-out are semantically related. Sometimes you can use "Blue-sky" instead an adjective phrase "Way-out".