This is part of a larger zoological hierarchy: Kingdom, Phylum, Class, Order, Family, Genus, and species. You can recognize family names because the end in idae; you can recognize orders because they end in iformes.
A Kingdom is defined as a group of phyla that are more similar to each other than they are to any other group of phyla. A Phylum is defined as a group of Classes that are more similar to each other than they are to any other group of classes. And so forth....
Only the species is objectively defined: the only real object.
Western Grebe with young