What are the word records for internal structure?

language/english/spelling/structure/subset.of.word/internal.structure New

New entry, edited from material collected for the archive and not yet in a released version.

Problem

What are the word records for internal structure?
(Spelling / Structure / Subset of Word)

  a.  nontrivial internal palindrome, longest [L25,7-24,89,18-12,20-99]
  b.  nontrivial internal tautonym, longest [11-221,12-23,13-39,88,15-18]
  c.  nontrivial internal head 'n' tail, longest
  d.  internal isogram [18-237,243]

[ 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. ]

a.  nontrivial internal palindrome, longest [L25,7-24,89,18-12,20-99]
        common word: sensuousness (11)
        phrase: yadda yadda yadda (14)
b.  nontrivial internal tautonym, longest [11-221,12-23,13-39,88,15-18]
        common words: possessed, pinging, commonsense, mudslinging, whinging, tzitzit, entente, binging, prepress, zinging, sentential, metastasis, tartaric, metastases, kinkiness, satiation, dinging, barbarically, gnatcatcher, ... and 61 others (6-t)
        uncommon word: countercountermeasure (14)
        hyphenated word: testament-testamentar (18)
c.  nontrivial internal head 'n' tail, longest
        common words: fractionation, bandstands, grandstands, handstands, hodgepodge (9-t)
        uncommon word: intestinointestinal (17)
        hyphenated phrase: wadi al-arabah, wadi arabah, wadi el-arabah (19)
d.  internal isogram [18-237,243]

-- Taxonomy of Wordplay, www.questrel.com