fluoroscopy vs radiology

fluoroscopy and radiology both are nouns.

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

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

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

Other hypernyms of fluoroscopy include radioscopy.

fluoroscopy (noun)	radiology (noun)
examination of body structures using a fluoroscope	(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation
	the branch of medical science dealing with the medical use of X-rays or other penetrating radiation