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Q: What exceptional words turn into other words by substitution and
transposition of letters?

A:
longest switchback (substitute first letter and reverse the rest)
OSCILLATE->METALLICS (9)
longest backswitch (substitute last letter and reverse the rest)
LEVITATORS->ROTATIVELY (10)
****
Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.