The Collaborative International Dictionary of English v.0.48:

Nomad \Nom"ad\, n. [L. nomas, -adis, Gr. ?, ?, pasturing,
   roaming without fixed home, fr. ? a pasture, allotted abode,
   fr. ? to distribute, allot, drive to pasture; prob. akin to
   AS. niman to take, and E. nimble: cf. F. nomade. Cf.
   Astronomy, Economy, Nimble, Nemesis, Numb,
   Number.]
   One of a race or tribe that has no fixed location, but
   wanders from place to place in search of pasture or game.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nomad \Nom"ad\, a.
   Roving; nomadic.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "nomad":
   Arab, Bedouin, Bohemian, Romany, Zigeuner, circumforaneous,
   discursive, divagatory, drifting, errant, flitting, floating,
   footloose, footloose and fancy-free, fugitive, gadding, gypsy,
   gypsy-like, gypsyish, landloping, meandering, migrational,
   migratory, nomadic, rambling, ranging, roaming, roving, shifting,
   straggling, straying, strolling, traipsing, transient, transitory,
   transmigratory, tzigane, vagabond, vagrant, wandering, zingaro