PS walnuts are not nuts.

, Iris Cohen writes
Why not, & if not, what are they?

Stewart Robert Hinsley schreef
Judd & al. say that they're drupes.

+ + +
So does everybody else. A nut is a hard dry fruit, eg. an acorn.
The walnut tree has a thick well-fleshed fruit, of which the pericarp is
commonly called a husk.

Walnuts are drupes, as are coconuts. As to peanuts ...
PvR