Nomads are nothing but early man's. the were termed as nomads because the used to roam here and there in search of food and shelter.they were also called nomads because they lead simple and nomadic life on earth later due to evolution they are able to do things on their own.they used sharply curved stones for hunting that's why they were called as nomads.

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Nomads are early humans who move from one place to another(rome).they rome in search of food shelter etc.
Mongal empire moved from one kigdom to other to occupie the world. as they romed their empire is called noamadic empire