photographic density vs density

photographic density and density both are nouns.

Word	Noun	Adjective	Verb	Adverb
photographic density	Yes	No	No	No
density	Yes	No	No	No

As nouns, density is a hypernym of photographic density; that is, density is a word with a broader meaning than photographic density:

photographic density: (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
density: the amount per unit size

Other hypernyms of photographic density include denseness.

photographic density (noun)	density (noun)
(physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation	the amount per unit size
	the spatial property of being crowded together