Re-duplicatives are words made by copying the sound of the first word in the second.
Example
'Honky-tonk', 'wishy-washy', 'mish-mash' and 'ping-pong' are examples of re-duplicative words.
In the classroom
Re-duplicatives are an interesting and creative area of vocabulary, and can be exploited to practise problematic areas of pronunciation, such as consonant clusters and rhyming sounds.
Further links:
https://www.teachingenglish.org.uk/article/rhyming-pair-game