This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
What exceptional words turn into other words by both insertion and
deletion of letters?
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.
 
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