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

A: longest onalosi (substitution in every position possible)

BANDIES:CANDIES->BUNDIES->BADDIES->BANGIES->BANDSES->BANDITS->BANDIED (7) BROWSES:CROWSES->BLOWSES->BREWSES->BROOSES->BROWZES->BROWSTS->BROWSED (7) CARACAS:MARACAS->CURACAS->CAMACAS->CARICAS->CARANAS->CARACKS->CARACAL (7) CLASSES:GLASSES->CHASSES->CLESSES->CLADSES->CLASHES->CLASSIS->CLASSED (7) COLLIES:BOLLIES->CALLIES->COALIES->COLBIES->COLLSES->COLLINS->COLLIED (7) PASTERS:BASTERS->PESTERS->PALTERS->PASSERS->PASTORS->PASTELS->PASTERN (7)

shortest isolano (no substitution possible)

EPI (3)

longest word, all letters changed to other letters in minimum number of steps, yielding another word THUMBING-THUMPING-TRUMPING-TRAMPING-

TRAPPING-CRAPPING-CRAPPINS-CRAPPIES-CRAPPOES (8)

longest word girders BADGER/SUNLIT, BUDLET/SANGIR (6) longest word with full vowel substitution

BATTINGS->BETTINGS->BITTINGS->BOTTINGS->BUTTINGS (8) CLACKING->CLECKING->CLICKING->CLOCKING->CLUCKING (8) RACKLING->RECKLING->RICKLING->ROCKLING->RUCKLING (8) and Y

CATES->CETES->CITES->COTES->CUTES->CYTES (5) DANES->DENES->DINES->DONES->DUNES->DYNES (5) MARAS->MARES->MARIS->MAROS->MARUS->MARYS (5)

longest words with vowel substitutions

DESTRUCTIBILITIES, DISTRACTIBILITIES (17)

longest word constant-letter-shifted to another PRIMERO-SULPHUR (7)

arithmetical-letter-shifted DREAM-ETHER (5) constant-shift-with-transposal (shiftgrams) AEROPHANE-SILVERITE (9)

longest word pair shifted one position on typewriter keyboard WAXIER-ESCORT (6) longest word pair confusable on a telephone keypad AMOUNTS-CONTOUR (7) **** Unless noted otherwise, all words occur in Webster's Third New International Dictionary, Merriam-Webster, Springfield, MA, 1961.

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