Did you know that all alligators are crocodiles, but that not all crocodiles are alligators?
Crocodiles and alligators are both part of the reptilian order Crocodylia. But they're part of different families, Crocodylidae and Alligatoridae respectively. Usually when people say "crocodile," they really mean "crocodilian." In total, there are some 23 unique species of crocodilians, including those in the lesser known family, Gavialidae.
So there, Crocodilian Dundee.