nonsense verse

WordReference Random House Unabridged Dictionary of American English © 2025

non′sense verse′, 

1. Poetry, Literature a form of light verse, usually for children, depicting imaginative characters in amusing situations of fantasy, whimsical in tone and with a rhythmic appeal, often employing fanciful phrases and meaningless made-up words.

• 1790–1800

Collins Concise English Dictionary © HarperCollins Publishers::

nonsense verse noun

1. verse in which the sense is nonexistent or absurd, such as that of Edward Lear