This question about cooking verbs is making me hungry!
Bake is the word used for making things from dough in an oven, especially bread, cake, pie, and cookies. <We baked a cake for her birthday.>
Toast is used to mean to make something warm and crisp (and usually brown or black) by heat - often using a toaster. <I like to toast my bagel and then butter it while it's warm.>
Roast is to cook food such as meat or vegetables in an oven. <Roast the pork for an hour.>
Grill means to cook food on a metal frame over a fire. <We grilled hamburgers at the cookout.>
Broil means to cook food directly over or under extreme heat. <Let's broil the steak for dinner.>
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All of these words also have colorful figurative senses. That will be the subject of another post!