angiography vs roentgenography

angiography and roentgenography both are nouns.

Word	Noun	Adjective	Verb	Adverb
angiography	Yes	No	No	No
roentgenography	Yes	No	No	No

As nouns, roentgenography is a hypernym of angiography; that is, roentgenography is a word with a broader meaning than angiography:

angiography: roentgenographic examination of blood vessels after injection of a radiopaque contrast medium; produces an angiogram
roentgenography: radiography that uses X-rays to produce a roentgenogram

Other hypernyms of angiography include X-ray photography.

angiography (noun)	roentgenography (noun)
roentgenographic examination of blood vessels after injection of a radiopaque contrast medium; produces an angiogram	radiography that uses X-rays to produce a roentgenogram