Polyphyletic is a term used to describe a group of organisms that do not share a common ancestor. Synonyms for Polyphyletic include unrelated, heterogeneous, divergent, and multifarious. These words can be used interchangeably to describe groups that have evolved independently and do not share a common ancestry. Other synonyms for Polyphyletic include disparate, varied, and dissimilar. This word is often used in the field of biology to describe groups of organisms that are not closely related, such as the various species of fish, or plants. Understanding these synonyms is important for accurately describing evolutionary relationships between different groups of organisms.