1. 
   hubs
   urban centres of employment and services
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   hubs
   hub
   Found op http://foldoc.org/hubs
   
   
3. 
   hubs
   1) Activity centers 2) Centers 3) Centers of activity 4) City centers 5) Cores 6) Focal points 7) Jfk et al. 8) Major airports 9) Major airports, e.g. 10) Meccas 11) Urban centres of employment and services 12) Wheel...
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/hubs/1
   
   

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