niche

corner, cranny, cubbyhole

cubicle

dent, embrasure, indent, indentation, indenture

ambry, housing, shrine

appointment, berth, billet, capacity, function, job, position, post

rank, standing, station, status

forte, long suit, métier (also metier), speciality, specialty, strong suit, thing

element, environment, environs, haunt, locality, medium, milieu, neighborhood, setting, surroundings