meddler

from WordNet (r) 3.0 (2006)

meddler
    n 1: an officious annoying person who interferes with others

from The Collaborative International Dictionary of English v.0.48

Meddler \Med"dler\, n.
   One who meddles; one who interferes or busies himself with
   things in which he has no concern; an officious person; a
   busybody.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

32 Moby Thesaurus words for "meddler":
      Dutch uncle, Paul Pry, Polonius, admonisher, adviser,
      backseat driver, busybody, butt-in, buttinsky, confidant,
      consultant, counsel, counselor, expert, guide, instructor,
      intermeddler, kibitzer, mentor, monitor, nestor, orienter,
      pragmatist, preceptist, prier, pry, quidnunc, rubberneck, snoop,
      snooper, teacher, yenta

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