Castles in air and Pipe dream

Pipe dream and castles in air are semantically related. in longing topic. In some cases you can use "Pipe dream" instead the phrase "Castles in air" as an adjective or a noun, when it comes to topics like daydream, imaginary, concept.

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

Castles in air and pipe dream are semantically related. Sometimes you can use "Castles in air" instead the phrase "Pipe dream" as a noun or an adjective.