arthrography vs roentgenography

arthrography and roentgenography both are nouns.

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

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

arthrography: roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram
roentgenography: radiography that uses X-rays to produce a roentgenogram

Other hypernyms of arthrography include X-ray photography.

arthrography (noun)	roentgenography (noun)
roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram	radiography that uses X-rays to produce a roentgenogram