業者
ぎょうしゃ · gyousha · JLPT N1 · noun
merchant
🏪 業 (trade) + 者 (person) = a person in trade: a trader or merchant
業 means business or trade, and 者 means person or one who does something. Put together, 業者 is someone whose job is trade.
者 — old/elder 耂 + say 曰
Originally depicted sugarcane or a similar plant, but the form was reanalyzed as 耂 (old) over 曰 (say). It became a grammatical suffix meaning 'one who…' or 'the…thing,' nominalizing verbs and adjectives. Today 者 mainly marks agents or categories, as in 学者 'scholar' or 记者 'reporter.'