There are several synonyms for mixed DNA bases tetrads. One alternative term is "heterogeneous base pairs tetrad," which means a group of four nucleotides containing different nitrogenous bases. Another synonym is "non-uniform DNA base quartet," which refers to a set of four nucleotides with varying base pairings. "Diverse DNA bases quadruplet" is another synonym for mixed DNA bases tetrads, which suggests a range of nucleotides with different base pair compositions. Ultimately, these synonyms all describe the same phenomenon, which is the presence of multiple base pairs within a single molecule of DNA.