 A name change may be due to purely nomenclatural reasons, that is, based on the rules of nomenclature; as for example when an older name is (re)discovered which has priority over the current name.Speaking in general, name changes for nomenclatural reasons have become less frequent over time as the rules of nomenclature allow for names to be conserved, so as to promote stability of scientific names.In zoological nomenclature, codified in the "International Code of Zoological Nomenclature", synonyms are different scientific names of the same taxonomic rank that pertain to that same taxon.