Lai fun are a short and thick rice noodle often used in soups. Ho fun (or he fun) are very wide and flat rice noodles often stir-fried with soy sauce or used in soups.
To prevent the underside of your sourdough bread from baking too dark, try the viral hack of pouring ¼ cup uncooked white rice into the bottom of your Dutch oven before adding the scored loaf.