phoenix
鷟 centers on the mythical phoenix, a legendary bird often associated with fire and rebirth.
鷟 combines 族 (tribe, family) with 鳥 (bird), likely a phono-semantic compound where 族 hints at the sound and 鳥 indicates a bird. The exact historical development is uncertain, but the structure points to a mythical bird name.
A tribe (族) of birds (鳥) gathers, and among them rises the legendary phoenix.
For サク, imagine a phoenix soaring over a sack (サク) of spices, its fiery feathers igniting the fragrant load.