Something that is almost certain to start an argument in the UK since there are many names for bread rolls depending on what region you hail from.
Here in the East Midlands they are called 'Cobs' i.e Chip Cob, Bacon Cob etc...
I'd be interested to know if there is any variation overseas
Hmmmmmmm
Well, a regular "Loaf" of sliced bread is generally called a Loaf.
Really long thin unsliced loaves like some French and Italian breads come in, are sometimes called "sticks".
What is often referred to as a "roll" here, may also be called a "bun" and is generally a single person's serving of bread.
A larger round of some types of French and Italian breads can be called "loaf", "round" or even "cake" of bread.
I'm sure there are many other references used in different parts of the country, and by different cultures within the country.
Pita bread, tortillas, unleavened bread and many other more traditionally named breads from the "Old World" are used here extensively as well.
You guys are making me hungry!
Bread rolls
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Roll:

Slice it in half and you have a bun
Nothing finer than a bacon and tomato(tinned) crusty cob
Roll:

Slice it in half and you have a bun
And add a hamburger patty and some cheese and you have a Cook Out.
Roll:

Slice it in half and you have a bun
Put some butter on the halves and stuff it with chips to make a lovely chip cob!
You guys are making me hungry!
Thought that might happen!