(Reuters) - Rival wine sellers targeting overworked mothers are fighting over use of the word "Mommy" on their wine labels, according to a lawsuit filed in San Francisco federal court. In the suit, filed on Monday, California-based winery Clos Lachance Wines asked the court to declare that its "Mommyjuice" does not violate the trademark of "Mommy's Time Out," which is marketed by a New Jersey distributor.