The Collaborative International Dictionary of English v.0.48:

Puck \Puck\, n. [OE. pouke; cf. OSw. puke, Icel. p[=u]ki an evil
   demon, W. pwca a hobgoblin. Cf. Poker a bugbear, Pug.]
   1. (Medi[ae]val Myth.) A celebrated fairy, "the merry
      wanderer of the night;" -- called also Robin Goodfellow,
      Friar Rush, Pug, etc. --Shak.
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            He meeteth Puck, whom most men call
            Hobgoblin, and on him doth fall.      --Drayton.
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   2. (Zool.) The goatsucker. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n. [Hind. pag foot.]
   A footprint; a track; as of a boar. [India]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, v. t. [imp. & p. p. Pugged; p. pr. & vb. n.
   Pugging.] [Cf. G. pucken to thump. beat.]
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   1. To mix and stir when wet, as clay for bricks, pottery,
      etc.
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   2. To fill or stop with clay by tamping; to fill in or spread
      with mortar, as a floor or partition, for the purpose of
      deadening sound. See Pugging, 2.
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n.
   1. Tempered clay; clay moistened and worked so as to be
      plastic.
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   2. A pug mill.
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   Pug mill, a kind of mill for grinding and mixing clay,
      either for brickmaking or the fine arts; a clay mill. It
      consists essentially of an upright shaft armed with
      projecting knives, which is caused to revolve in a hollow
      cylinder, tub, or vat, in which the clay is placed.
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n. [Corrupted fr. puck. See Puck.]
   1. An elf, or a hobgoblin; also same as Puck. [Obs.] --B.
      Jonson.
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   2. A name for a monkey. [Colloq.] --Addison.
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   3. A name for a fox. [Prov. Eng.] --C. Kingsley.
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   4. An intimate; a crony; a dear one. [Obs.] --Lyly.
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   5. pl. Chaff; the refuse of grain. [Obs.] --Holland.
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   6. A prostitute. [Obs.] --Cotgrave.
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   7. (Zool.) One of a small breed of pet dogs having a short
      nose and head; a pug dog.
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   8. (Zool.) Any geometrid moth of the genus Eupithecia.
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WordNet (r) 3.0 (2006):

pug
    n 1: small compact smooth-coated breed of Asiatic origin having
         a tightly curled tail and broad flat wrinkled muzzle [syn:
         pug, pug-dog]

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "pug":
   Chinese boxer, arch, bantamweight, black belt, blocky, boss, boxer,
   brown belt, bruiser, bump, chubby, chunky, clubfoot, colophon,
   concavity, convexity, dactylogram, dactylograph, dent, digit, dint,
   dog, dumpy, embossment, excrescence, extremity, fat, featherweight,
   fetlock, fighter, fingerprint, fisticuffer, flyweight, foot,
   footmark, footprint, footstep, forefoot, forepaw, fossil footprint,
   harefoot, heavyweight, heel, hoof, ichnite, ichnolite, impress,
   impression, imprint, indent, indentation, indention, instep,
   karate expert, light heavyweight, lightweight, lump, middleweight,
   pad, palooka, pastern, patte, paw, paw print, pawmark,
   pedal extremity, pedes, pes, pied, pimple, podgy, print,
   prizefighter, pudgy, pugged, pugilist, pugmark, retrousse,
   savate expert, seal, sigil, signet, snub-nosed, sole, sparrer,
   splayfoot, squat, squattish, squatty, stamp, step, stocky, stubbed,
   stubby, stud, stumpy, thickset, thumbmark, thumbprint, toe, tootsy,
   trotter, tubby, turned-up, ungula, vestige, welterweight