What’s the difference between a bunny, a rabbit and a hare?

Hares and Rabbit are both have a scientific name and it is both in the family of Leporidae, but they're separate species. Both Rabbit and Hares have powerful back legs, long ears and a divided upper lip but hares are larger that rabbits. Bunny was used as a term of endeearmenr for a young girl but as time passed by it started to mean as a young or small animal and it is usually means a rabbit. 

i don't know