No, a cinquain does not have to rhyme. A cinquain is a five-line poem with a set pattern of syllables in each line: 2, 4, 6, 8, and 2. Rhyming is optional in a cinquain.
Most poems in cinquain form follow a rhyme scheme of ABABB, ABAAB, or ABCCB.
NEVER
a nursery rhyme
One for Sorrow - nursery rhyme - was created in 1780.
The nursery rhyme with the initials MPHAD is "Mary Had a Little Lamb."
The nursery rhyme with the initials "BSWTS" is "Baa, Baa, Black Sheep."
The nursery rhyme with the initials IRIP is "It's Raining, It's Pouring."
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In the nursery rhyme "Birds of a Feather," the birds will flock together.
The queen baked a pie for the king in the nursery rhyme "Sing a Song of Sixpence." The maid in the nursery rhyme serves the pie to the king.
I've never thought of it as a nursery rhyme but more just a silly song for kids.