fluoroscopy vs radioscopy

fluoroscopy and radioscopy both are nouns.

Word	Noun	Adjective	Verb	Adverb
fluoroscopy	Yes	No	No	No
radioscopy	Yes	No	No	No

As nouns, radioscopy is a hypernym of fluoroscopy; that is, radioscopy is a word with a broader meaning than fluoroscopy:

fluoroscopy: examination of body structures using a fluoroscope
radioscopy: (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation

Other hypernyms of fluoroscopy include radiology.

fluoroscopy (noun)	radioscopy (noun)
examination of body structures using a fluoroscope	(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation