I think the terms are synonomous mostly. Though I understand Nomads mainly follow their heard of cattle as it follows the rains to graze. So for short term contract workers perhaps hobo is more apt.
Which recalls the term "Bobo" .. which is the original term for a hipster: Bourgeois Bohemian
Which recalls the term "Bobo" .. which is the original term for a hipster: Bourgeois Bohemian
Also probably a play on the term.