Poetry and Rhymes

Which of these is a word for the rhythmical element in poetry?

More Questions from Poetry and Rhymes
What English poet wrote "Prometheus Unbound"?
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What Spanish language poet won the 1990 Nobel Prize in Literature?
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Where did "Old Mother Hubbard" look for a bone?
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When the ants were marching one by one, what did the little one stop to do?
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In the poem "The Owl and the Pussycat", what color is their boat?
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Who did "Simple Simon" meet when he went to the fair?
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What do the first, second and fifth lines of a limerick end with?
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What grand old Duke had ten thousand men and marched them up to the top of the hill ?
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