cyclicity vs periodicity

cyclicity and periodicity both are nouns.

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

As nouns, cyclicity and periodicity are synonyms defined as:

cyclicity and periodicity: the quality of recurring at regular intervals

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