arthrogram vs X-ray

arthrogram and X-ray both are nouns.

Word	Noun	Adjective	Verb	Adverb
arthrogram	Yes	No	No	No
X-ray	Yes	No	No	No

As nouns, X-ray is a hypernym of arthrogram; that is, X-ray is a word with a broader meaning than arthrogram:

arthrogram: an X ray of a joint after the injection of a contrast medium
X-ray: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

Other hypernyms of arthrogram include roentgenogram, X-ray photograph, X-ray picture, X ray.

arthrogram (noun)	X-ray (noun)
an X ray of a joint after the injection of a contrast medium	a radiogram made by exposing photographic film to X rays; used in medical diagnosis
	electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target