Major components are the antonyms for minor parts. A minor part is a smaller piece or component that is part of a larger system or object. Major components, on the other hand, are the most important and largest parts of an object or system. For example, in a car, the engine, transmission, and suspension are major components, while the seat belts or the steering wheel cover are minor parts. Similarly, in a computer system, the motherboard, processor, hard drive, and RAM are major components, while the mouse or the keyboard are minor parts. In summary, while minor parts add to the functionality of a system or object, major components are the essential parts that make it work.