What is an antonym for spoonerism?

There isn't a single, perfect antonym for "spoonerism" because it describes a specific linguistic phenomenon. However, depending on what aspect of a spoonerism you want to contrast, some options are:

* Accurate speech: This contrasts with the intentional or unintentional mispronunciation that defines a spoonerism.

* Correct pronunciation: This focuses on the intended sounds being produced accurately.

* Clear communication: This emphasizes the lack of confusion or misunderstanding that often arises from a spoonerism.

* Fluent speech: This highlights the smooth and uninterrupted nature of speech, unlike the often humorous disruption of a spoonerism.

Ultimately, the most fitting "antonym" would depend on the context in which you are using the term.