world

World is a market place, consisting of waterbodies, materials, peoples, animals, trees and plants, good and bad atmosphere and many other things. People who have excess material sell it those who need it and buy from them the materials they need. This is called barter system, though the medium of exchange of materials is money. You and me are part of this system.

universe: everything that exists anywhere; "they study the evolution of the universe"; "the biggest tree in existence"