They are actually from two different families under the species titled “crocodilians”. Crocodiles belong to the crocodylidae family, alligators to the alligatoridae family.
There are also physical differences between the two: crocodiles have very long and narrow snouts that are V-shaped while alligators’ snouts are wider and more U-shaped.
The upper jaw of an alligator is wider than the lower one, when it’s mouth is closed only the upper teeth show. A crocodile’s jaws are equal in width, and so when closed you can see teeth from the bottom and the top. The way I remember this is by thinking of “crocodile smile,” in case that helps.
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