What an antonym of word synecdoche?

There isn't a single perfect antonym for "synecdoche" because it's a specific literary device. However, depending on the context, some good alternatives might be:

If you want to emphasize the use of the whole instead of the part:

* Whole

* Literal

* Exact

* Complete

If you want to emphasize the use of the part instead of the whole:

* Specific

* Individual

* Precise

* Detailed

If you want to emphasize the lack of figurative language:

* Plain language

* Literal language

* Direct language

* Denotation

Ultimately, the best antonym depends on the specific meaning you want to convey.

Let me know if you have a specific example in mind and I can help you find the most suitable word!