This spelling riddle asks: What word has three pairs of double letters in a row? It sounds unusual because very few common English words contain three consecutive doubled-letter pairs.
The answer is: bookkeeper.
Look closely at the spelling:
b-oo-kk-ee-per
The word contains the pairs oo, kk, and ee one after another. That gives it three sets of double letters in a row.
The related word “bookkeeping” works the same way, but “bookkeeper” is the classic answer to this riddle.
Because we usually read familiar words as a whole rather than examining every letter, it is easy to miss just how unusual this spelling pattern is until someone points it out.
