As far as I know, there is no single English word for a ten-day period (note hyphen). "decade" means ten years, and it would be completely wrong to use it to mean ten days.
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GPYAs far as I know, there is no single English word for a ten-day period (note hyphen).If there were, John Reed could have used it in his book about the Russian Revolution, "Ten Days that Shook the World."