The term "extinct species" refers to a species of organisms that no longer exists on earth. However, there are several synonyms we can use to describe this term. "Vanished species" is one such phrase, and it describes species that have disappeared entirely from the face of the earth. "Extirpated species" refers to species that are no longer found in a particular region, but can still be found in other parts of the world. "Lost species" refers to species that have been lost due to habitat destruction or other human activities. Finally, "obsolete species" is a synonym that describes species that are no longer relevant in their ecosystem. These synonyms help us to capture the nuances of different types of species loss.