X-ray vs roentgenogram

X-ray and roentgenogram both are nouns.

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

As nouns, X-ray and roentgenogram are synonyms defined as:

X-ray and roentgenogram: a radiogram made by exposing photographic film to X rays; used in medical diagnosis

Other synonyms of X-ray include X-ray photograph, X-ray picture, X ray.

X-ray (noun)	roentgenogram (noun)
a radiogram made by exposing photographic film to X rays; used in medical diagnosis	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