Blue-sky and Pipe dream

Blue-sky adjective - Without immediate commercial value.

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

Pipe dream noun - A conception or image created by the imagination and having no objective reality.

Blue-sky and pipe dream are semantically related. Sometimes you can replace phrase "Blue-sky" with "Pipe dream", this phrases are similar.