Here's a breakdown:

* Crocodilia: This is the order of reptiles that encompasses all crocodilians, including crocodiles, alligators, caimans, and gharials.

* Crocodylidae: This is the family within the order Crocodilia that specifically includes crocodiles, alligators, and caimans.

So, "Crocodylidae" is a broader term than "crocodile", which refers only to a specific genus within the family Crocodylidae.