Bread was a rock band from Los Angeles, California. They placed 13 songs on the Billboard Hot 100 chart between 1970 and 1977 and were a prime example of what later was labeled soft rock. -
oops, wrong definition.
Bread is a staple food prepared by cooking a dough of flour and water and often additional ingredients. -
no mention of shape or size
A
bread roll is a piece of bread, usually small and round and is commonly considered a side dish. Bread rolls are often used in the same way as sandwiches are—cut transversely, with fillings placed between the two halves. -
Aha! Size and shape and use.
Also, bread roll allows for disambiguation. Otherwise you may be asking for:
a Cabbage
roll
a sausage
roll
an Egg
roll
a Spring
roll
a Meat
roll
a
roll in the hay
Depending in the place and situation, asking for a
roll may get you something entirely different (including a possible slap in the face).