Once and for all:
All ceteceans are whales, and modern whales are divided into two Suborders: toothed (Odontoceti) and baleen (Mysticeti) whales. There are four superfamilies of Toothed whales: Delphinoidea (which include oceanic dolphins, belugas, narwhals and porpoises; Inioidea, Liptotoidea and Platanistoidea (all river dolphins); Physeteroidea (sperm whales and allies) and Ziphioidea (the elusive beaked whales).
There is no monophyletic classification that can include the other whales while excluding dolphins. That is an arbitrary distinction.
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