synchronisation vs synchroneity

synchronisation and synchroneity both are nouns.

Word	Noun	Adjective	Verb	Adverb
synchronisation	Yes	No	No	No
synchroneity	Yes	No	No	No

As nouns, synchronisation and synchroneity are synonyms defined as:

synchronisation and synchroneity: the relation that exists when things occur at the same time

Other synonyms of synchronisation include synchronicity, synchronism, synchronization, synchronizing, synchrony.

synchronisation (noun)	synchroneity (noun)
coordinating by causing to indicate the same time	the relation that exists when things occur at the same time
an adjustment that causes something to occur or recur in unison
the relation that exists when things occur at the same time