radiograph vs skiagraph

radiograph and skiagraph both are nouns.

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

As nouns, radiograph and skiagraph are synonyms defined as:

radiograph and skiagraph: 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, skiagram.

radiograph (noun)	skiagraph (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)