What are the word records for isomorph or matching letter pattern (words that repeat letters in the same...

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Problem

What are the word records for isomorph or matching letter pattern (words that repeat letters in the same places)?
(Spelling / Structure / Entire Word)

  a.  longest well-mixed [6-146,7-238]
  b.  shortest word with no matching isomorph
  c.  short patterns
  i.  four letters, all 15 possible [4-228,5-3]
  d.  transposal or same numbers of repeated letters
  i.  ten letters, all 42 possible [4-231,5-14]

[ Editor: question framed by the editor from the headings of the Taxonomy of Wordplay. ]

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[ Editor: from the Taxonomy of Wordplay, www.questrel.com, retrieved 28 Oct 2026. Classes (common, uncommon, hyphenated words, phrases), scores, ties (-t) and the source codes in brackets are explained in language/english/word.records.introduction. ]

Sources: [12-181]

e.g., DADDY = MOMMY since D & M in 1st, 3rd, 4th places
a.  longest well-mixed [6-146,7-238]
        common words: comprehensible & counterexample (14-t)
        common words: decolonization & underestimates (14-t)
        common words: discriminative & simplification (14-t)
        common words: breathtakingly & chlorpromazine (14-t)
        common words: excommunicated & transsexuality (14-t)
        common words: coevolutionary & unsynchronized (14-t)
        common words: recolonization & underestimates (14-t)
        common words: excommunicates & transsexuality (14-t)
        common words: rambunctiously & thermodynamics (14-t)
        uncommon words: hygroexpansivity & hypermasculinity (16-t)
        uncommon words: neurochemistries & postchlorination (16-t)
        phrases: breakdown voltages & granulocytopenias (17-t)
        phrases: knights commanders & meadow spittlebugs (17-t)
        phrases: bacteriophagouses & working hypothesis (17-t)
b.  shortest word with no matching isomorph
        common words: eel (3)
        uncommon words: zzz (3)
c.  short patterns
        i.  four letters, all 15 possible [4-228,5-3]
        ii.  five letters, all 52 possible [4-113,12-106]
        iii.  six letters, all 203 possible [4-229,5-3]
        iv.  eight letters with two doubles, all 210 possible [9-206]
d.  transposal or same numbers of repeated letters
        i.  ten letters, all 42 possible [4-231,5-14]

-- Taxonomy of Wordplay, www.questrel.com