unpolished rice
糲 centers on rice that is coarse and unrefined, specifically unpolished rice that retains its outer bran layer.
糲 combines 米 (rice) with 厲, which likely contributes the sound and carries a sense of harshness or coarseness, reflecting unpolished rice.
The left side is 米 (rice), and the right side 厲 looks harsh and rough. Picture rice that is still rough and unpolished, straight from the field.
For レイ, imagine a layer of bran still on the rice: layer -> レイ, and the unpolished rice keeps its outer layer.
unpolished rice; unrefined rice