stickler

stickler
    n 1: someone who insists on something; "a stickler for
         promptness"
    

Stickler \Stic"kler\ (st[i^]k"kl[~e]r), n. [See {Stickle}, v.
   t.]
   One who stickles. Specifically: 
   [1913 Webster]
   (a) One who arbitrates a duel; a sidesman to a fencer; a
       second; an umpire. [Obs.]
       [1913 Webster]

             Basilius, the judge, appointed sticklers and
             trumpets whom the others should obey. --Sir P.
                                                  Sidney.
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             Our former chiefs, like sticklers of the war,
             First sought to inflame the parties, then to poise.
                                                  --Dryden.
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   (b) One who pertinaciously contends for some trifling things,
       as a point of etiquette; an unreasonable, obstinate
       contender; as, a stickler for ceremony.
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             The Tory or High-church were the greatest sticklers
             against the exorbitant proceedings of King James
             II.                                  --Swift.
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49 Moby Thesaurus words for "stickler":
      Simon Legree, absolute monarch, absolute ruler, all-powerful ruler,
      arrogator, ass, autarch, autocrat, bigot, bitter-ender, bullethead,
      caesar, captious critic, commissar, czar, despot, dictator,
      diehard, disciplinarian, dogmatist, donkey, driver, duce, fanatic,
      hard master, hardnose, intransigeant, intransigent, last-ditcher,
      martinet, maverick, mule, nitpicker, oligarch, oppressor,
      perfectionist, perverse fool, pharaoh, pighead, positivist,
      precisian, precisianist, purist, slave driver, standpat,
      standpatter, tyrant, usurper, warlord