skiagraph vs radiograph

skiagraph and radiograph both are nouns.

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

As nouns, skiagraph and radiograph are synonyms defined as:

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

Other synonyms of skiagraph include radiogram, shadowgraph, skiagram.

skiagraph (noun)	radiograph (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)