absorbance vs photographic density

absorbance and photographic density both are nouns.

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

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

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

Other synonyms of absorbance include optical density, transmission density.

absorbance (noun)	photographic density (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