Epizeuxis

ep·​i·​zeux·​is

Noun

the immediate repetition of a word or phrase for rhetorical or poetic effect

“War is hell, hell” the major muttered as he looked over the field of casualties.

Could not find when this word first appeared but for a change it goes back to LATE Latin, who stole it from the Greek word epizeugnynai meaning to join or yoke together.