tomogram vs X-ray picture

tomogram and X-ray picture both are nouns.

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

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

tomogram: A tomogram is an X-ray image produced by tomography.
X-ray picture: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

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

tomogram (noun)	X-ray picture (noun)
A tomogram is an X-ray image produced by tomography.	a radiogram made by exposing photographic film to X rays; used in medical diagnosis