hub
1. [ noun ] the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes
Related terms: part propeller electric_fan car_wheel
2. [ noun ] a center of activity or interest or commerce or transportation; a focal point around which events revolve
Examples:

"the playground is the hub of parental supervision" "the airport is the economic hub of the area"

Related terms: center
3. [ noun ] the center of a city
Synonyms: municipal_center down_town civic_center
Related terms: center city
Similar spelling:   hubby
  Huf
  Hupp
  Hupa
  huff
  huffy