Nouns

(n)anadiplosis, reduplicationrepetition of the final words of a sentence or line at the beginning of the next
(n)reduplicationthe syllable added in a reduplicated word form
(n)reduplicationa word formed by or containing a repeated syllable or speech sound (usually at the beginning of the word)
(n)reduplication, reiterationthe act of repeating over and again (or an instance thereof)