A Lynn, Mass., company that makes the Marshmallow Fluff brand has sued Williams-Sonoma Inc., claiming the culinary retailer is misusing the registered trademark Fluffernutter.

Durkee-Mower Inc. claims in a lawsuit filed in U.S. District Court in Boston that Williams-Sonoma has been selling a marshmallow and peanut butter chocolate-covered candy named Fluffernutter without permission of the Lynn company.