Tetragraph is a term that refers to a four-letter combination or a sequence of four letters that makes up a distinct code that represents a specific element. However, there are other terms that can be used interchangeably with tetragraph, depending on the context of its usage. These synonyms include quadrigraph, quadriphonic, quadruple, tetralogy, and quadrilateral, among others. These synonyms for tetragraph are useful for those who want to diversify their vocabulary, or for academic and professional purposes to avoid over-repetition of the same term. Using synonyms is also an excellent way to add color and life to your writing or speech.