fiefdom
noun a region of activity, knowledge, or influence <you'll have to ask that guy—the project is his fiefdom> Synonyms area,
arena,
bailiwick,
barony,
business,
circle,
demesne,
department,
discipline,
domain,
element,
fief,
fiefdom,
firmament,
front,
game,
kingdom,
line,
precinct,
province,
realm,
specialty,
sphere,
terrain,
walk Related Words frontier;
study,
subject;
territory,
turf;
occupation,
profession,
pursuit,
racket,
vocation;
ambit,
amplitude,
breadth,
compass,
confine,
dimension(s),
extent,
ken,
reach,
scope,
sweep,
width;
subfield,
subspecialty 
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