disorderly, messy, huge, big
龐 centers on something large and imposing, often with a sense of disorder or messiness that comes from overwhelming size. The core idea is a huge, sprawling mass that is hard to keep tidy.
龐 combines 广 (building) with 龍 (dragon), originally suggesting a huge, imposing building or a dragon's massive, disorderly form. The exact historical development is uncertain, but the component combination likely conveyed largeness and disorder.
Under a broad roof 广, a dragon 龍 sprawls messily, its huge body filling the space in a disorderly heap. The scene captures both the huge size and the messy disorder of 龐.
For ホウ, imagine a huge, messy hall (ホール, hōru) where a dragon has made a disorderly nest: hall -> ホウ, and the dragon's huge, messy presence fills the space.