The Collaborative International Dictionary of English v.0.48:

Neb \Neb\ (n[e^]b), n. [AS. nebb head, face; akin to D. neb,
   Icel. nef, beak of a bird, nose, Dan. naeb beak, bill, Sw.
   n[aum]bb, n[aum]f, and prob. also to D. sneb, snavel, bill,
   beak, G. schnabel, Dan. & Sw. snabel, and E. snap. Cf. Nib,
   Snap, Snaffle.]
   The nose; the snout; the mouth; the beak of a bird; a nib, as
   of a pen. [Also written nib.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

neb
    n 1: a long projecting or anterior elongation of an animal's
         head; especially the nose [syn: snout, neb]
    2: horny projecting mouth of a bird [syn: beak, bill, neb,
       nib, pecker]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "neb":
   aculeus, acumination, antlia, auger, beak, beezer, bill, bit,
   borer, bugle, conk, cusp, drill, mucro, muffle, muzzle, nares,
   needle, nib, nose, nostrils, nozzle, olfactory organ, pecker,
   point, prick, prickle, proboscis, rhinarium, rostrum, schnozzle,
   smeller, snoot, snout, sting, tip, trunk