hairbreadth

Hairbreadth \Hair"breadth`\ (-br[e^]dth), Hair's breadth
\Hair's" breadth`\ (h[^a]rz"-).
   The diameter or breadth of a hair; a very small distance;
   sometimes, definitely, the forty-eighth part of an inch.
   [Also spelled {hairsbreadth}.]
   [1913 Webster]

         Every one could sling stones at an hairbreadth and not
         miss.                                    --Judg. xx.
                                                  16.
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Hairbreadth \Hair"breadth`\, a.
   Having the breadth of a hair; very narrow; as, a hairbreadth
   escape.
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40 Moby Thesaurus words for "hairbreadth":
      ace, bit, bowshot, brief span, close quarters, close range,
      closeness, confinement, crack, crowdedness, earreach, earshot,
      gunshot, hair, hair space, hairsbreadth, incapaciousness, inch,
      incommodiousness, limitation, little, little ways, narrow gauge,
      narrowness, nearness, pistol shot, restrictedness, restriction,
      short distance, short piece, short way, slenderness, span,
      spitting distance, step, straitness, strictness, tight squeeze,
      tightness, whisker