Electronic device and Thermionic tube

Electronic device noun - A device that accomplishes its purpose electronically.

Thermionic tube and electronic device are semantically related. In some cases you can replace phrase "Thermionic tube" with "Electronic device", this phrases are similar.

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

Electronic device and thermionic tube are semantically related. You can use "Electronic device" instead a noun phrase "Thermionic tube".