“Bookkeeper”, “bookkeeping” and “sweettooth” are the only 3 words in the English language with three consecutive double letters

There are only 3 words in the English language that contain 3 sets of consecutive double letters. They are:

• bookkeeper
• bookkeeping
• sweettooth

There are others that contain 3 sets of double letters but not consecutively. Some are:

• assessee
• keelless
• Mississippi
• committee
• keenness
• addressee