https://www.litcharts.com/literary-devices-and-terms/cacophony
Some websites define cacophony as any word, phrase, or sentence that is difficult to pronounce. For example, one website gives the famous tongue-twister "She sells seashells by the seashore" as an example of cacophony, but this is a mistake. ... To the tintinnabulation that so musically wells From the bells, bells, bells, bells, Bells, bells ...