An example of a thick stem is the edible stem of the Rhubarb plant.
it is thick
A tree is one example. The sunflower usually has a thick stem. Rhubarb is another (edible stalk) thick stemmed plant.
A tree and the woody stem is called the trunk
A trunk ;)
flower power
A tuber.
Yes they do
false
the thick part
That is called a tuber.
joker
Perhaps a "tree trunk".