posteriority vs subsequentness

posteriority and subsequentness both are nouns.

Word	Noun	Adjective	Verb	Adverb
posteriority	Yes	No	No	No
subsequentness	Yes	No	No	No

As nouns, posteriority and subsequentness are synonyms defined as:

Other synonyms of posteriority include subsequence.

posteriority (noun)	subsequentness (noun)
the quality of being toward the back or toward the rear end	following in time
following in time