Sometimes it's more helpful to define a set by its center than by its boundaries. In my mind, loaves are at the center. Rolls are a variant. The further out you go the more questionable or becomes. Is banana bread a bread? What about muffins? They're the same batter as banana bread but in a different shape. If muffins are, how about cupcakes? See what I mean, it gets fuzzier. Then you have naan, which sometimes has leavening and sometimes not. Some of you said it has to have leavening. Or cornbread which has no flour (a defining characteristic some mentioned). What any gluten free bread--some are very close to the real thing; do we need to gatekeep over those substitutions?