absorbance vs transmission density

absorbance and transmission density both are nouns.

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

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

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

Other synonyms of absorbance include optical density, photographic density.

absorbance (noun)	transmission 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