The concept of a hierarchy of life can also be referred to as a "taxonomic classification system" or "biological classification." It refers to the organization of living things into a specific order based on their characteristics and genetic makeup. The system starts with the most general classification (domain) and gradually narrows down to the most specific (species). Other synonyms for the hierarchy of life include the "tree of life," "phylogenetic tree," or "evolutionary tree." These synonyms help to emphasize the interconnectedness and evolutionary history of all living organisms on Earth, highlighting the diversity and complexity of life in all its forms.