rhythmicity vs metre

rhythmicity and metre both are nouns.

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

As nouns, metre is a hyponym of rhythmicity; that is, metre 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
metre: rhythm as given by division into parts of equal duration

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

rhythmicity (noun)	metre (noun)
the rhythmic property imparted by the accents and relative durations of notes in a piece of music	rhythm as given by division into parts of equal duration
	(prosody) the accent in a metrical foot of verse
	the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)