Monorhyme is a type of poem that uses only one rhyme throughout the entire poem. That means that each line of the poem, no matter how long or short, has to end with a word that rhymes with every other line.
For example, if we were writing a monorhyme poem about a cat, every line would have to end with a word that rhymes with "cat." So maybe our first line could be "My cat is black as a top hat," and the next line could be "She likes to nap on a mat." Each line has to rhyme with "cat" and every other line.
Monorhyme can be really fun to read and write, because it sounds kind of like a song or a chant, with the same rhyme repeating over and over. It can also be a bit challenging to come up with different lines that all rhyme with each other, but it can be a great exercise for creativity and wordplay.