The Collaborative International Dictionary of English v.0.48:

Creak \Creak\ (kr[=e]k), v. i. [imp. & p. p. Creaked
   (kr[=e]kt); p. pr. & vb. n. Creaking.] [OE. creken, prob.
   of imitative origin; cf. E. crack, and. D. krieken to
   crackle, chirp.]
   To make a prolonged sharp grating or squeaking sound, as by
   the friction of hard substances; as, shoes creak.
   [1913 Webster]

         The creaking locusts with my voice conspire. --Dryden.
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         Doors upon their hinges creaked.         --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

Creak \Creak\, v. t.
   To produce a creaking sound with.
   [1913 Webster]

         Creaking my shoes on the plain masonry.  --Shak.
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The Collaborative International Dictionary of English v.0.48:

Creak \Creak\ (kr[=e]k), n.
   The sound produced by anything that creaks; a creaking.
   --Roget.
   [1913 Webster]

WordNet (r) 3.0 (2006):

creak
    n 1: a squeaking sound; "the creak of the floorboards gave him
         away" [syn: creak, creaking]
    v 1: make a high-pitched, screeching noise; "The door creaked
         when I opened it slowly"; "My car engine makes a whining
         noise" [syn: whine, squeak, screech, creak,
         screak, skreak]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "creak":
   caterwaul, chirk, chirking, chirp, chirrup, crick, howl, keen,
   pipe, screak, scream, screech, shriek, shrill, skirl, skreigh,
   squawk, squeak, squeal, stridulate, stridulation, ululate,
   ululation, wail, whine, whistle, wrawl, yammer