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fat
In Japanese, there is no visible indication, it is determined by the context.
He was a sumo wrestler.
There were ten sumo in that stable.
What English-speakers think of when they say "sumo" (i.e. heavyset men wrestling) is also called "sumo" in Japanese. Basically, sumo is sumo!
Sumo is a Japanese sport. There are Chinese sumo wrestlers.
Sumo