nonsense verse
US /ˈnɑːnsəns vɜːrs/
UK /ˈnɑːnsəns vɜːrs/
1.
poetry that is intentionally absurd or humorous, often characterized by illogical content, made-up words, and whimsical imagery, without a clear narrative or meaning
:
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Edward Lear is famous for his nonsense verse, like 'The Owl and the Pussy-cat'.
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The children giggled at the silly rhymes and made-up words in the nonsense verse.