rhythmicity vs cadency

rhythmicity and cadency both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhythmicity	Yes	No	No	No
cadency	Yes	No	No	No

As nouns, cadency is a hyponym of rhythmicity; that is, cadency is a word with a more specific, narrower meaning than rhythmicity:

rhythmicity: the rhythmic property imparted by the accents and relative durations of notes in a piece of music
cadency: a recurrent rhythmical series

Other hyponyms of rhythmicity include meter, metre, time, cadence, lilt, swing.

rhythmicity (noun)	cadency (noun)
the rhythmic property imparted by the accents and relative durations of notes in a piece of music	a recurrent rhythmical series