noun
A literary or poetic term for a person who roams without a fixed home. Not common in everyday speech; modern Japanese would more often use 放浪者 or 漂流者.
彼は蓬客のように各地を旅して回った。
He traveled around like a wanderer.
蓬 (yomogi, 'mugwort') + 客 (guest, traveler). The image is of a traveler as rootless as windblown mugwort. The exact origin is uncertain, but it is a classical Chinese-derived compound.