Rikishi
A professional sumo wrestler
Yokozuna
Grand champion — the highest rank in sumo, held by very few wrestlers
Ozeki
Champion — the second-highest rank
Sekiwake
The third-highest rank in the top division
Komusubi
The fourth-highest rank, just above maegashira
Maegashira
The rank-and-file wrestlers of the top division. They are numbered from 1 downwards, usually as far as 16 or 17. An unpaired Maegashira 18 appears when the san’yaku count is odd, because Makuuchi is fixed at 42 slots
Oyakata
A stable master and coach — usually a retired top-division wrestler
Gyoji
The referee who officiates bouts in the ring
Shinpan
Ringside judges who can overturn the referee's decision
Yobidashi
Announcers who call wrestlers to the ring and perform ceremonial duties
Tokoyama
Hairdressers who style the traditional chonmage topknot
Toshiyori
An elder of the Sumo Association — retired wrestlers who hold coaching licenses