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Words containing two or more adjacent pairs of identical letters positioned sequentially in the spelling (such as the three consecutive double letters in "bookkeeper": oo-kk-ee).
In the English language, words with multiple consecutive pairs of identical letters are remarkably rare. "Bookkeeper" (and its derivations like "bookkeeping" and "subbookkeeper") is the only common English word possessing three consecutive pairs of double letters without hyphens. Words with two adjacent double letters include "committee" (mm-tt-ee), "balloon" (ll-oo), "raccoon" (cc-oo), "tattoo" (tt-oo), and "coffee" (ff-ee).
Check if an English word contains consecutive duplicate letters:
Verified English words exemplifying consecutive double letters with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
The only standard non-hyphenated English word with three consecutive double letter pairs is "bookkeeper" (and related derivatives like "bookkeeping" and "subbookkeeper"), containing the pairs "oo", "kk", and "ee".