noun
peddler; hawker; itinerant merchant
Refers to a person who travels around selling goods, often in historical or traditional contexts. In modern usage, it may evoke a somewhat old-fashioned image, though still used for street vendors or traveling salespeople.
江戸時代には、行商人が村から村へと商品を売り歩いた。
In the Edo period, peddlers traveled from village to village selling goods.
彼は若い頃、行商人として日本中を旅した。
When he was young, he traveled all over Japan as a peddler.
露天商 is a street stall vendor who sells from a fixed outdoor location, whereas 行商人 moves from place to place.
Compound of 行商 (gyōshō, 'peddling, itinerant trade') + 人 (nin, 'person'). The term is straightforward and transparent.