synchronism vs synchronisation

synchronism and synchronisation both are nouns.

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

As nouns, synchronism and synchronisation are synonyms defined as:

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

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

synchronism (noun)	synchronisation (noun)
the relation that exists when things occur at the same time	coordinating by causing to indicate 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