==> language/english/spelling/operations.on.words/insertion.and.deletion.s <==
   longest word both charitable and hospitable 
    AMY: AM,AY,MY;GAMY,ARMY,AMOY,AMYL 
   shortest word both stingy and hostile  IMPETUOUS (9)
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Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.