What are the word records for switch word (letters like train cars can be switched to a siding), longest?

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Problem

What are the word records for switch word (letters like train cars can be switched to a siding), longest?
(Spelling / Structure / Entire Word)

[ 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: [M38, 1-11,2-59,5-6,205, Dudeney]

common words: sensuousness, interpreting (12-t)
uncommon word: sensuousnesses (14)
phrase: yadda yadda yadda (15)

-- Taxonomy of Wordplay, www.questrel.com