The word hub is a noun. Hub means (1) the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes, (2) a center of activity or interest or commerce or transportation; a focal point around which events revolve.
The following articles and web pages elaborate on the word hub.
Traditional bicycle wheels contain a central hub surrounded by wire spokes that connect the hub to a circular rim. This bicycle wheelset guide includes links to bicycle wheel suppliers.
Helsinki is the capital city and economic hub of Finland; the city is also known for its beautiful architecture, excellent cafes and restaurants, theaters and galleries, and plentiful shopping.
The following articles provide recent hub-related news.
With the arrival of the Dia Beacon, this Hudson River city became a weekend destination for New Yorkers. Now many have come to stay.
C. J. Hughes. New York Times. Wednesday, 28 Oct 2020 16:54:18 +0000.