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Synonyms for World (same or very similar meaning)

WordNet sense 1 (everything that exists anywhere):
cosmos, creation, existence, macrocosm, universe

WordNet sense 2 (people in general considered as a whole):
populace, public

WordNet sense 3 (people in general; especially a distinctive group of people with some shared interest):

WordNet sense 4 (the 3rd planet from the sun; the planet we live on):
earth, globe

WordNet sense 5 (all of your experiences that determine how things appear to you):

WordNet sense 6 (the concerns of this life as distinguished from heaven and the afterlife):
worldly concern, earthly concern

WordNet sense 7 (all of the living human inhabitants of the earth):
humanity, humankind, man, mankind, humans, human beings, human race

WordNet sense 8 (involving the entire earth; not limited or provincial in scope):
global, planetary, worldwide

From the ODE community, based on WordNetadd/edit