Civilization is basically a vital kind of grouping. Without civilizations, the world as we know it would not be. Civilizations have different qualities than regular groups of people such as nomads. For example, a civilization develops surpluses of things which helps the people be a stable community. These surpluses also create the construction and growth of cities and helps develop secure, formal states. Government is also present in civilizations. One very important part of a civilization is an advanced writing method. A civilization can only be complete with all of these factors, or it will just fall apart.
Nomads are nowhere close to being a civilization even though sometimes groups of nomads have good technology. Nomads travel around all the time following food. A civilization is a stationary place with agriculture. This means that the community of people occupying this civilization does not have to go running around scrounging for food. Nomads are just a small group of people without cities, sometimes without writing, no organizations, and their technology is lacking. Civilizations have the one-up on nomads without a doubt. If everyone was just a bunch of nomads, the world would not be organized, and cultures would not be as complex and great as they are today. Nomads are just a bunch of underdeveloped, not modern, and sometimes barbaric people.