The only difference is the amount of stock used in the dish. Depending on ingredients, soups can take as little as 20 minutes to make while stews require less stock and its ingredients should “stew” for a longer period of time to meld its flavors.
Also, keep in mind that many times soup ingredients are cooked separately and then added to the broth. Examples: noodles, rice, chicken, beef, etc. This is because you run the risk of either under or overcooking an ingredient or the items you are using may be leftovers. It makes sense to add cooked leftovers at the end of the cooking process.
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