3. Actually, it is the only English word with 3 sets of double letters in a row.
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.
The only one I can think of is bookkeeper. Are there others?
bookkeeper
Yes. 3x3=9 3 sets of 3 = 9
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Mississippi
Mississippi & Tennessee
Bookkeeper. Although Subbookkeeper has four.
Bookkeeper
Bookkeeper
Well, there's probably more than three. Right now I could only think of "balloon" and raccoon though, assuming that you meant those double letters have to be next to each other.