Some while ago, we began to consider the whole class of words (and other dictionary items) where the first part rhymes with the second part. Many of the simplest examples are what are called second-order reduplication. In a second-order reduplication, the spelling of the first and second parts differ by only a single letter (for example, HOOTCHIE-KOOTCHIE). Not all second-order reduplications necessarily have the two halves rhyming (for example, MISHMASH and SENSED).
Word Ways: Vol. 19
, Article 19.
Available at: http://digitalcommons.butler.edu/wordways/vol19/iss2/19