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Q: What exceptional words turn into other words by insertion of letters?

A:    longest hydration (double reheadment)  (D,R)EVOLUTIONIST (12/13)
   longest hospitable word (insert letter anywhere)
    CARES: SCARES, CHARES, CADRES, CARIES, CARETS, CARESS
   shortest hostile word (no deletion possible)  SYZYGY (6)
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Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.
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