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)sphereany spherically shaped artifact (n)sector, spherea particular aspect of life or activity“he was helpless in an important sector of his life” (n)spherea solid figure bounded by a spherical surface (including the space it encloses) (n)spherea three-dimensional closed surface such that every point on the surface is equidistant from the center