Some words that have two of the same letter in a row, also called a double letter, are;
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4 letter words, letters 2 and 3 are the same:allybeetbeenbeefbeepbeerbeesboomboonbootcookcoolcoopdeepdeeddeerdoomdoorfeedfeelfeesfeetfoodfoolfootgoodheelhoodhoofhoophootjeepkeepleerloomloonlooplootmeetmoodmoonseedeggsElla
Onion
Skiing and taxiing (what a plane does on the ground).
addallAnnassbeeboocoofeegeegooillinnerrneeoddoffseetee
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