nemesister
n.— «All the skaters share an unmistakable bond. “We’re all friends, and we’re all in this together, but I’m gonna kick your a- Sunday night,” Sister Mary Jane explained. “We have a term for the relationship: nemesisters.”» —“Rollergirls” by Jonathan Storm Philadelphia Inquirer (Pa.) Jan. 1, 2006. (source: Double-Tongued Dictionary)