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Use "cooperator" in a sentence
"One of the main Arab American organizations in the country said that the word cooperator (ph) is a very negative connotation of the Arabic language, that it suggests something more akin to collaborator, someone whose siphoned out, and this is likely to hinder cooperation among Arab Americans in the program."
"Fish and Wildlife Service agreed not to oppose the highway -- in fact, to be a "willing cooperator" with the Indiana Department of Transportation."
"Mr. Slaine, after he was approached by the Federal Bureau of Investigation in July 2007, became a key cooperator in gathering evidence for the government in a much broader insider-trading probe."