babygram vs X-ray picture

babygram and X-ray picture both are nouns.

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

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

babygram: an X-ray of the entire body of an infant.
X-ray picture: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

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

babygram (noun)	X-ray picture (noun)
an X-ray of the entire body of an infant.	a radiogram made by exposing photographic film to X rays; used in medical diagnosis