Radio spectrum and Visible spectrum

Radio spectrum noun - The entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television.

Visible spectrum and radio spectrum are semantically related. in electromagnetic frequencies topic. In some cases you can use "Visible spectrum" instead a noun phrase "Radio spectrum".

Visible spectrum noun - The distribution of colors produced when light is dispersed by a prism.

Radio spectrum and visible spectrum are semantically related. Sometimes you can replace phrase "Radio spectrum" with "Visible spectrum", this phrases are similar.