bitewing vs X-ray film

bitewing and X-ray film both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitewing	Yes	No	No	No
X-ray film	Yes	No	No	No

As nouns, X-ray film is a hypernym of bitewing; that is, X-ray film is a word with a broader meaning than bitewing:

bitewing: a dental X-ray film that can be held in place by the teeth during radiography
X-ray film: photographic film used to make X-ray pictures

bitewing (noun)	X-ray film (noun)
a dental X-ray film that can be held in place by the teeth during radiography	photographic film used to make X-ray pictures