Crocodile Vs. Alligator

Alligators and crocodiles are two different species. Hence one should clearly differentiate when they are writing or talking about them.

Crocodile: Crocodiles are giant water reptiles that grow up to 5 meters, and live for seventy to hundred years. Crocodiles have sharp V shaped snouts.

Example: Saltwater crocodiles in Australia are one of the most dangerous animals living on this planet.

Alligator: Alligators are native only to America and China. They are not as big as crocodiles. They live in freshwater. 

Example: I spotted an alligator by the side of a river in my recent trip to Louisiana.