periodicity vs cyclicity

periodicity and cyclicity both are nouns.

Word	Noun	Adjective	Verb	Adverb
periodicity	Yes	No	No	No
cyclicity	Yes	No	No	No

As nouns, periodicity and cyclicity are synonyms defined as:

periodicity and cyclicity: the quality of recurring at regular intervals

periodicity (noun)	cyclicity (noun)
the quality of recurring at regular intervals	the quality of recurring at regular intervals