poetic rhythm vs metre

poetic rhythm and metre both are nouns.

Word	Noun	Adjective	Verb	Adverb
poetic rhythm	Yes	No	No	No
metre	Yes	No	No	No

As nouns, metre is a hyponym of poetic rhythm; that is, metre is a word with a more specific, narrower meaning than poetic rhythm:

Other hyponyms of poetic rhythm include beat, cadence, measure, meter, sprung rhythm.

poetic rhythm (noun)	metre (noun)
(prosody) a system of versification	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)