radioscopy vs imaging

radioscopy and imaging both are nouns.

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

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

radioscopy: (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation
imaging: (medicine) obtaining pictures of the interior of the body

Other hypernyms of radioscopy include tomography.

radioscopy (noun)	imaging (noun)
(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation	(medicine) obtaining pictures of the interior of the body
	the ability to form mental images of things or events