phlebogram vs X-ray picture

phlebogram and X-ray picture both are nouns.

Word	Noun	Adjective	Verb	Adverb
phlebogram	Yes	No	No	No
X-ray picture	Yes	No	No	No

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

phlebogram: an X ray of a vein injected with a radiopaque contrast medium
X-ray picture: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

Other hypernyms of phlebogram include roentgenogram, X-ray, X-ray photograph, X ray.

phlebogram (noun)	X-ray picture (noun)
an X ray of a vein injected with a radiopaque contrast medium	a radiogram made by exposing photographic film to X rays; used in medical diagnosis