synchrony vs synchronism

synchrony and synchronism both are nouns.

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

As nouns, synchrony and synchronism are synonyms defined as:

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

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

synchrony (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