What is using the same word or phrase for emphasis in poetry called?

The use of the same word or phrase for emphasis in poetry is called repetition.

Here are some specific types of repetition commonly found in poetry:

* Anaphora: Repeating the same word or phrase at the beginning of successive clauses or sentences.

* Epizeuxis: Repeating the same word or phrase immediately after itself, for emphasis.

* Diacope: Repeating a word or phrase with one or two words in between.

* Epanalepsis: Repeating the same word or phrase at the beginning and end of a sentence or clause.

While the term "repetition" is the most general, specifying the type of repetition can be useful for discussing the specific effect the poet is trying to achieve.