Roentgenoscope and X-ray machine

Roentgenoscope noun - An X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation.

X-ray machine and roentgenoscope are semantically related. In some cases you can use "X-ray machine" instead a noun "Roentgenoscope".

X-ray machine noun - An apparatus that provides a source of X rays.

Roentgenoscope and X-ray machine are semantically related. Sometimes you can replace term "Roentgenoscope" with "X-ray machine", this terms are similar.