This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鄷 is a rare character. It combines 豊 (abundant) with the city/walled-town component ⻏, suggesting a place name. The exact historical development is uncertain.
The left side 豊 suggests abundance, and the right side ⻏ often marks a place. Picture a prosperous walled town overflowing with goods.
For ホウ, imagine the abundant town's name is Hou: Hou -> ホウ, and the town walls (⻏) enclose the riches (豊).