The Collaborative International Dictionary of English v.0.48:

Hob \Hob\, n. [Prob. akin to hump. Cf. Hub. ]
   [1913 Webster]
   1. The hub of a wheel. See Hub. --Washington.
      [1913 Webster]

   2. The flat projection or iron shelf at the side of a fire
      grate, where things are put to be kept warm. --Smart.
      [1913 Webster]

   3. (Mech.) A threaded and fluted hardened steel cutter,
      resembling a tap, used in a lathe for forming the teeth of
      screw chasers, worm wheels, etc.
      [1913 Webster]

   4. A peg, pin, or mark used as a target in some games, as an
      iron pin in quoits; also, a game in which such a target is
      used.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Hob \Hob\, n. [Orig. an abbrev. of Robin, Robert; Robin
   Goodfellow a celebrated fairy, or domestic spirit. Cf.
   Hobgoblin, and see Robin.]
   1. A fairy; a sprite; an elf. [Obs.]
      [1913 Webster]

            From elves, hobs, and fairies, . . .
            Defend us, good Heaven !              --Beau. & FL.
      [1913 Webster]

   2. A countryman; a rustic; a clown. [Obs.] --Nares.

The Collaborative International Dictionary of English v.0.48:

Hob \Hob\, n. (Zool.)
   The male ferret.
   [Webster 1913 Suppl.] Hobanob

The Collaborative International Dictionary of English v.0.48:

nave \nave\ (n[=a]v), n. [AS. nafu; akin to D. naaf, G. nabe,
   OHG. naba, Icel. n["o]f, Dan. nav, Sw. naf, Skr. n[=a]bhi
   nave and navel: cf. L. umbo boss of a shield. [root]260. Cf.
   Navel.]
   1. The block in the center of a wheel, from which the spokes
      radiate, and through which the axle passes; -- called also
      hub or hob.
      [1913 Webster]

   2. The navel. [Obs.] --hak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hob
    n 1: (folklore) a small grotesque supernatural creature that
         makes trouble for human beings [syn: goblin, hob,
         hobgoblin]
    2: (folklore) fairies that are somewhat mischievous [syn: elf,
       hob, gremlin, pixie, pixy, brownie, imp]
    3: a hard steel edge tool used to cut gears
    4: a shelf beside an open fire where something can be kept warm
    v 1: cut with a hob

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "hob":
   Ariel, Befind, Corrigan, Finnbeara, Mab, Oberon, Titania, banshee,
   beam-end, brownie, chimney, chimney corner, cluricaune, corbel,
   dwarf, elf, fairy, fairy queen, fay, fender, fire screen,
   fireboard, fireguard, fireplace, fireside, flue, gnome, goblin,
   gradin, gradino, gremlin, hearth, hearthstone, hobgoblin, hub, imp,
   ingle, inglenook, ingleside, kobold, ledge, leprechaun, mantel,
   mantelshelf, ouphe, peri, pixie, pooka, predella, puca, pwca,
   retable, shelf, shoulder, smokehole, sprite, superaltar, sylph,
   sylphid