roentgenogram vs radiograph

roentgenogram and radiograph both are nouns.

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

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

roentgenogram: a radiogram made by exposing photographic film to X rays; used in medical diagnosis
radiograph: a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)

Other hypernyms of roentgenogram include radiogram, shadowgraph, skiagram, skiagraph.

roentgenogram (noun)	radiograph (noun)
a radiogram made by exposing photographic film to X rays; used in medical diagnosis	a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)