Phrases refer to oral rhymes, and sentences vary in length. It's purely spoken. It's easy to say. They have no fixed meter and rhyme, and pay more attention to the fluency and rhythm of language.
Limerick is a kind of poem with popular language and random rhythm. It is said that Zhang Dayou in the Tang Dynasty wrote this poem, which was later called a doggerel. Limerick has a certain rhythm and format, but it is more casual and free than traditional poetry.