transmission density vs absorbance

transmission density and absorbance both are nouns.

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

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

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

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

transmission 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