Synonyms for Universe (same or very similar meaning)
WordNet sense 1 (everything that exists anywhere):
cosmos, creation, existence, macrocosm, worldWordNet sense 2 ((statistics) the entire aggregation of items from which samples can be drawn):
populationWordNet sense 3 (everything stated or assumed in a given discussion):
universe of discourseFrom the ODE community, based on WordNetadd/edit