photographic density vs absorbance

photographic density and absorbance both are nouns.

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

As nouns, photographic density and absorbance are synonyms defined as:

photographic density and absorbance: (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation

Other synonyms of photographic density include optical density, transmission density.

photographic density (noun)	absorbance (noun)
(physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation	(physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation