what is the difference between a bunny and a rabbit?

Different names is all

 Another term for a young rabbit is bunny, though this term is often applied informally (particularly by children) to rabbits generally, especially domestic ones.

I.  The spelling

II. The pronuciation

III. The difference in letters.

IV. The diofference of syllables.

Bunnies are cute.  Basically, they are two words for the same thing, but, with a slightly different connotation.

Nothing at all. "Bunny" is merely a slang term for a rabbit. A young rabbit is called a kit. Bunny does not refer to any particular age of rabbit.

Bugs is a bunny you silly wabbit.

Too little to mention since they only differ by a hare.

Age .

It's the same thing you fool