There are several synonyms for the term "syntactic structure," which essentially refers to the way words are organized to create meaningful sentences. One common synonym is "sentence structure," which specifically refers to the way that words are organized in a sentence to convey meaning. Another synonym is "grammar," which encompasses not only the way words are organized in a sentence, but also the rules governing how words are used and combined in a language. "Syntax" is another synonym for "syntactic structure," and refers specifically to the study of how words are organized in sentences, including the rules governing word order and sentence structure.