transparency vs transparentness

transparency and transparentness both are nouns.

Word	Noun	Adjective	Verb	Adverb
transparency	Yes	No	No	No
transparentness	Yes	No	No	No

As nouns, transparency and transparentness are synonyms defined as:

transparency and transparentness: the quality of being clear and transparent

Other synonyms of transparency include transparence.

transparency (noun)	transparentness (noun)
picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector	the quality of being clear and transparent
the quality of being clear and transparent
permitting the free passage of electromagnetic radiation