yokozuna

1. (sumo) The highest rank of sumo wrestler, above ozeki; grand champion.Examples: "A yokozuna is the very highest rank in sumo – “just like Mameha's position in Gion,” as Nobu explained it to me. I had no reason to doubt him; but if Mameha ever took half as much time entering a party as these yokozuna took entering the ring, she'd certainly never be invited back."

2. (sumo) A person holding the rank, either competing at the rank or retired after having achieved it.Examples: "What mattered most was that, from the very top of the Nihon Sumo Kyōkai, Yokozuna Akebono had been shown respect."