fiefdom
noun [ C ] uk/ˈfiːf.dəm/ us/ˈfiːf.dəm/
old use (also fief, /fiːf/ /fiːf/)领地;（尤指）采邑，封地
an area of land, especially one that is rented and paid for by work
势力范围，领域
an area or type of activity that is controlled by someone
The stage is his personal fiefdom. 舞台是他的私人领地。