頭語
  とうご
  noun (common) (futsuumeishi)
  [e.g. 拝啓 and 謹啓 etc.]
  the opening greeting on letters
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  統語
  とうご
  noun or verb acting prenominally (other than the above)
  syntactic
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  倒語
  とうご
  noun (common) (futsuumeishi)
  inverted word
  verlan
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