shadowgraph vs radiogram

shadowgraph and radiogram both are nouns.

Word	Noun	Adjective	Verb	Adverb
shadowgraph	Yes	No	No	No
radiogram	Yes	No	No	No

As nouns, shadowgraph and radiogram are synonyms defined as:

shadowgraph and radiogram: a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)

Other synonyms of shadowgraph include radiograph, skiagram, skiagraph.

shadowgraph (noun)	radiogram (noun)
a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)	a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)
	a message transmitted by wireless telegraphy