The Collaborative International Dictionary of English v.0.48:

Gullet \Gul"let\, n. [OE. golet, OF. Goulet, dim. of gole,
   goule, throat, F. gueule, L. gula; perh. akin to Skr. gula,
   G. kenle; cf. F. goulet the neck of a bottle, goulotte
   channel gutter. Cf. Gules, Gully.]
   1. (Anat.) The tube by which food and drink are carried from
      the pharynx to the stomach; the esophagus.
      [1913 Webster]

   2. Something shaped like the food passage, or performing
      similar functions; as:
      (a) A channel for water.
      (b) (Engin.) A preparatory cut or channel in excavations,
          of sufficient width for the passage of earth wagons.
      (c) A concave cut made in the teeth of some saw blades.
          [1913 Webster]

WordNet (r) 3.0 (2006):

gullet
    n 1: the passage between the pharynx and the stomach [syn:
         esophagus, oesophagus, gorge, gullet]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "gullet":
   abdomen, abomasum, bay window, beerbelly, belly, breadbasket, craw,
   crop, diaphragm, embonpoint, esophagus, fauces, first stomach,
   gizzard, goozle, gorge, gut, guzzle, hals, honeycomb stomach,
   kishkes, manyplies, maw, midriff, omasum, paunch, pharynx, pot,
   potbelly, potgut, psalterium, pusgut, rennet bag, reticulum, rumen,
   second stomach, spare tire, stomach, swagbelly, third stomach,
   throat, tum-tum, tummy, underbelly, ventripotence, weasand,
   wizen