Polyallelism is a complex term used in linguistics to describe the phenomenon of having multiple parallel structures in a sentence. It can be quite challenging to find synonyms for this word as it is quite technical and specific. However, some possible synonyms for polyallelism include parallelism, repetition, symmetry, similarity, and duplication. These words highlight the idea of having similar structures or patterns repeated throughout a sentence or text. Other related terms include parallel construction, chiasmus, and antithesis, which are all techniques used to create balance and emphasize ideas in writing and speech. Overall, the use of synonyms for polyallelism can help to make technical language more accessible to a wider audience.