The registry of the American Kennel Club is based on parentage and not the coat color of a member of any breed.
"In 1987 the AKC, in corporation with the Labrador Retriever Club of America, conducted an inquiry into the breeding of litters that contained members that were registered as silver. An AKC representative was sent to observe these dogs. The report and color photographs of these dogs were reviewed by AKC staff and representatives of the Labrador Retriever Club of America. Both Parties were satisified that there was no reason to doubt that the dogs were purebred Labrador Retrievers, however they felt that the dogs were incorrectly registered as silver. Since the breed standard at the time describe chocolate as ranging in shade from sedge to chocolate, it was felt that the dogs could more accurately be described as chocolate rather than silver." (Robert Young, AKC)

There are three different colors of Labrador recognized by the American Kennel Club.

Those colors are:  Yellow, Black, & Chocolate

Missing from the list, you’ll notice, are:  Silver, Charcoal, & Champagne

Just as the Silver Coat is a dilute version of Chocolate,  Charcoal is a dilute version of Black,
and Champagne is a diluted version of Yellow.