Open English Wordnet
Nouns
(n)sphere, domain, area, orbit, field, arenaa particular environment or walk of life“his social sphere is limited”,
“it was a closed area of employment”,
“he's out of my orbit” (n)domain, demesne, landterritory over which rule or control is exercised“his domain extended into Europe”,
“he made it the law of the land” (n)world, domainpeople in general; especially a distinctive group of people with some shared interest“the Western world”