Rectifying tube and Thermionic vacuum tube

Rectifying tube noun - A thermionic tube having two electrodes; used as a rectifier.

Thermionic vacuum tube and rectifying tube are semantically related. In some cases you can use "Thermionic vacuum tube" instead a noun phrase "Rectifying tube".

Thermionic vacuum tube noun - Electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope.

Rectifying tube and thermionic vacuum tube are semantically related. Sometimes you can replace phrase "Rectifying tube" with "Thermionic vacuum tube", this phrases are similar.