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)

**** Unless noted otherwise, all words occur in Webster's Third New International Dictionary, Merriam-Webster, Springfield, MA, 1961.

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