Yes, hub is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
hub
Noun
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
What Scrabble words can I make with the letters in hub?
2 Letter Words