I'd like to add 'bap' to your list. I think it is a Yorkshire word but wouldn't bet on it.

And if you really want to widen the discussion you need to look at all the things they'll offer you in a sandwich shop in Sydney - pitta bread, lavash, focaccia and so on. One of the best things about living in a melting pot of immigration!

What about mantou - Chinese steamed roll made from wheat, with or without filling? IS this a bread or a dumpling?

What makes bread bread? Is it the ingredients or the cooking methods or both?