epizeuxis
The repetition of words in immediate succession for emphasis.
countable, uncountable
And graces thus the theme on which it treats.
An Epizeuxis twice a word repeats,
Where it comes from
Learned borrowing from Ancient Greek ἐπι- (epi-) + ζευγνύναι (zeugnúnai, “to yoke”)
Adapted from the Wiktionary entry epizeuxis (CC BY-SA 4.0).