What is when a poet uses the same word three time in row?

There's no specific term for using the same word three times in a row in poetry. However, it's a stylistic choice that can be used for emphasis, rhythm, or to create a particular effect.

Here are some related terms and ideas:

* Repetition: The general term for using the same word or phrase multiple times.

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

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

* Tricolon: Using three parallel phrases or clauses.

* Emphasis: Repeating a word can make it stand out and emphasize its meaning.

* Rhythm: Repetition can create a sense of rhythm or a musical effect.

* Sound devices: Repeating a word can contribute to alliteration, assonance, or consonance.

Ultimately, the effect of repeating a word three times in a row depends on the context and the poet's intention.