What is an antonym for the word alliteration?

There isn't a single perfect antonym for "alliteration" because it describes a specific literary device. However, here are some options depending on what you're trying to express:

* Non-alliteration: This is the most straightforward antonym, simply indicating the absence of alliteration.

* Assonance: This is a literary device that uses the repetition of vowel sounds, which is distinct from alliteration's consonant repetition.

* Consonance: While also using consonant sounds, consonance focuses on the repetition of similar sounds at the end of words, whereas alliteration focuses on the beginning.

* Lack of repetition: This broadly encompasses any use of language that avoids repetitive sounds.

The best antonym for "alliteration" will depend on the specific context and the nuance you're aiming for.