The Collaborative International Dictionary of English v.0.48:

Knob \Knob\, v. i.
   To grow into knobs or bunches; to become knobbed. [Obs.]
   --Drant.
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The Collaborative International Dictionary of English v.0.48:

Knob \Knob\, n. [A modification of knop. Cf. Nob.]
   1. A hard protuberance; a hard swelling or rising; a bunch; a
      lump; as, a knob in the flesh, or on a bone.
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   2. A knoblike ornament or handle; as, the knob of a lock,
      door, or drawer. --Chaucer.
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   3. A rounded hill or mountain; as, the Pilot Knob. [U. S.]
      --Bartlett.
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   4. (Arch.) See Knop.
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   Knob latch, a latch which can be operated by turning a
      knob, without using a key.
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The Collaborative International Dictionary of English v.0.48:

Knop \Knop\ (n[o^]p), n. [OE. knop, knoppe; cf. D. knop, knoop,
   G. knopf, Dan. knap, knop, Sw. knapp, knopp, button, bud,
   Icel. knappr, and E. knap, n. Cf. Knap, Knob.]
   1. A knob; a bud; a bunch; a button.
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            Four bowls made like unto almonds, with their knops
            and their flowers.                    --Ex. xxv. 21.
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   2. (Arch.) Any boldly projecting sculptured ornament; esp.,
      the ornamental termination of a pinnacle, and then
      synonymous with finial; -- called also knob, and
      knosp.
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   Knop sedge (Bot.), the bur reed (Sparganium); -- so
      called from its globular clusters of seed vessels.
      --Prior.
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WordNet (r) 3.0 (2006):

knob
    n 1: a circular rounded projection or protuberance [syn: knob,
         boss]
    2: a round handle
    3: any thickened enlargement [syn: node, knob, thickening]
    4: an ornament in the shape of a ball on the hilt of a sword or
       dagger [syn: knob, pommel]