What are some exceptional words containing doubled and repeated letters, etc.?

language/english/spelling/letter.pattern/subset.of.word Restored

This entry was in an earlier release of the archive and is restored here.

Problem

 What are some exceptional words containing doubled and repeated letters, etc.?

Show solution

  longest internal palindrome  (SENSUOUSNES)S (11)
  longest internal tautonym 
   M(ETHYLETHYL)PYRIDINE 
   longest repeated prefix  (MICROMICRO)FARAD (10)
  most consecutive doubled letters  BOOKKEEPER (3)
  most repeated letters in a word  POSSESSIONLESSNESSES (9,S)
  longest n-cadences (2-cadence = alternating monotony)  
   HUMUHUMUNUKUNUKUAPUAA (2x8) EFFERVESCENCE (3x5) STRESSLESSNESS (4x4)
   NONCONTAMINATION (5x4)