What are the word records for letters restricted to mathematical sequences?

language/english/spelling/alphabetical.order/entire.word/letters.restricted.to.mathematical.sequences New

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Problem

What are the word records for letters restricted to mathematical sequences?
(Spelling / Alphabetical Order / Entire Word)

  a.  all letters restricted to squares = ADIPY, longest
  b.  all letters restricted to primes = BCEGKMQSW, longest
  c.  all letters restricted to Fibonacci sequence = ABCEHMU, longest

[ 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: [5-51,108]

a.  all letters restricted to squares = ADIPY, longest
        common words: payday, papaya (6-t)
        hyphenated word: yada-yada-yada (12)
        phrase: yadda yadda yadda (15)
b.  all letters restricted to primes = BCEGKMQSW, longest
        common words: emcees, cesses, messes (6-t)
        uncommon words: meseemses, sweeswees (9-t)
c.  all letters restricted to Fibonacci sequence = ABCEHMU, longest
        common words: became, hubbub (6-t)
        uncommon word: macacahuba (10)

-- Taxonomy of Wordplay, www.questrel.com