This is the 1399th most frequent Japanese word.
商
"商" means "commerce" or "trade."
In this sentence, 商 is used as part of 商業, which means commerce or trade. 商 here relates to business activities.
この地域は商業が盛んです。
This region is flourishing in commerce.
Here, 商 is used in 商売, meaning business or trade, indicating commercial activities.
彼の家族は商売をしています。
His family runs a business.
In this sentence, 商 is part of 商人, which means merchant, indicating a person involved in trade and commerce.