This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To occur again; to recur.

""We used to treat 100 women (with chemotherapy) to benefit two or three," Kotwall said, adding that for patients to qualify for the new approach, they have to show low or medium risk that the cancer will reoccur, which is determined through genetic testing on the tumor."

reoccurring    reoccurs   

reoccurrence   

Burr    Fleur    Fur    Kerr    Monsieur