What is the only word in the world with 4 consecutive double letters?!

Question: What is the only word in the world with 4 consecutive double letters!?

for example bOOKKEEper is 3 consecutive double letters!.Www@Enter-QA@Com

Answers:

SUBBOOKKEEPERWww@Enter-QA@Com

it's subbookkeeperWww@Enter-QA@Com

subbookkeeperWww@Enter-QA@Com

flooddeeppending!. !?

grasshopperWww@Enter-QA@Com

oonnaarr!?Www@Enter-QA@Com

MmmmmmmmWww@Enter-QA@Com

um hint!.!.!.PLEEEEASE!?!?!?Www@Enter-QA@Com

I GOT NO IDEA!. ANSWER NOT ON GOOGLEWww@Enter-QA@Com

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