radiograph vs skiagram

radiograph and skiagram both are nouns.

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

As nouns, radiograph and skiagram are synonyms defined as:

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

Other synonyms of radiograph include radiogram, shadowgraph, skiagraph.

radiograph (noun)	skiagram (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)