angiogram vs roentgenogram

angiogram and roentgenogram both are nouns.

Word	Noun	Adjective	Verb	Adverb
angiogram	Yes	No	No	No
roentgenogram	Yes	No	No	No

As nouns, roentgenogram is a hypernym of angiogram; that is, roentgenogram is a word with a broader meaning than angiogram:

angiogram: an X-ray representation of blood vessels made after the injection of a radiopaque substance
roentgenogram: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

Other hypernyms of angiogram include X-ray, X-ray photograph, X-ray picture, X ray.

angiogram (noun)	roentgenogram (noun)
an X-ray representation of blood vessels made after the injection of a radiopaque substance	a radiogram made by exposing photographic film to X rays; used in medical diagnosis