synchronicity vs synchronism

synchronicity and synchronism both are nouns.

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

As nouns, synchronicity and synchronism are synonyms defined as:

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

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

synchronicity (noun)	synchronism (noun)
the relation that exists when things occur at the same time	the relation that exists when things occur at the same time