possibility vs possibleness

possibility and possibleness both are nouns.

Word	Noun	Adjective	Verb	Adverb
possibility	Yes	No	No	No
possibleness	Yes	No	No	No

As nouns, possibility and possibleness are synonyms defined as:

possibility and possibleness: capability of existing or happening or being true

possibility (noun)	possibleness (noun)
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena	capability of existing or happening or being true
a possible alternative
a future prospect or potential
capability of existing or happening or being true