Scallions, also known as green onions, are a type of onion that is closely related to leeks and shallots. They are characterized by their long, thin green stalks and white bulbs. Scallions have a milder flavor than other types of onions, making them a popular choice for salads, soups, and stir-fries. Leeks, which have five letters, are similar to scallions but have a larger white bulb and a more intense flavor. Shallots, which have eight letters, are also related to scallions and have a milder flavor than regular onions.