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.

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