name of Zhou period state
酆 is a historical proper noun referring to a state during the Zhou period. Its standalone meaning is limited to this name.
酆 combines 豐 (abundant, lush) with the city enclosure ⻏, likely representing a place name. The exact historical development is uncertain.
The left side 豐 suggests abundance, and the right side ⻏ is a city wall. Picture a prosperous walled city called 酆, the Zhou period state.
For フウ, imagine the wind (風, ふう) blowing through the abundant fields of the 酆 state: ふう -> フウ.