hub
[noun]
Synonyms: centre, core, focal point, focus, heart, middle, nerve centre

[TahlilGaran] English Synonym Dictionary ▲

hub /hʌb/ noun [countable]
[Date: 1500-1600; Origin: Probably from ⇒ hob(1)]

1. the central and most important part of an area, system, activity etc, which all the other parts are connected to Synonym : centre
hub of
Birmingham is at the hub of Britain’s motorway network.
the commercial hub of the region

2. the central part of a wheel to which the axle is joined

[TahlilGaran] Dictionary of Contemporary English ▲