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bookkeeper
The English word BOOKKEEPING or BOOKKEEPER has three sets of consecutive double letters. SUBBOOKKEEPER is the only word with four sets of consecutive double letters, although these words should be hyphenated.
coffeetoffeesettee
tattooballooncommitteekeennessraccooncoffeebookkeeper
Mississippi
One of the longest words with double letters is "bookkeeper," which has three sets of double letters (oo, kk, ee). Another contender is "bookkeeping," which also features the same double letters. Both words are commonly cited in discussions about words with repeating letters.
balloon coffee
ballon embarrass coffee raccoon tennessee mississippi football
The following words have three consecutive sets of double letters:bookkeeperbookkeepersbookkeeping
Mississippi has three sets of doubled letters, two double s pairs, and one double p pair. Tennessee also has three pairs of doubled letters in its name.