hub

hʌb/

noun

1. 1.

   the central part of a wheel, rotating on or with the axle, and from which the spokes radiate.

   synonyms:

   pivot, axis, fulcrum, centre, centre point "the spokes radiate from the hub of the wheel"

2. 2.

   the effective centre of an activity, region, or network.

   "the city has always been the financial hub of the country"

   synonyms:

   centre, centre of activity, core, heart, focus, focal point, middle,nucleus, kernel, nerve centre "the kitchen was the hub of family life"