contemporaneity vs contemporaneousness

contemporaneity and contemporaneousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
contemporaneity	Yes	No	No	No
contemporaneousness	Yes	No	No	No

As nouns, contemporaneity and contemporaneousness are synonyms defined as:

contemporaneity and contemporaneousness: the quality of being current or of the present

Other synonyms of contemporaneity include modernism, modernity, modernness.

As nouns, contemporaneity and contemporaneousness are synonyms defined as:

contemporaneity and contemporaneousness: the quality of belonging to the same period of time

contemporaneity (noun)	contemporaneousness (noun)
the quality of being current or of the present	the quality of being current or of the present
the quality of belonging to the same period of time	the quality of belonging to the same period of time