The tree consists of many parts.
the leaves
the twigs
the branches
the limbs
the trunk
the roots
the tap root
the bark
the sap
Phrases and idioms
He was as helpless as a leaf in the wind.
The root of the problem.
We tried to root him out but he did not come out.
We branched out from there.
We have a branch in Moscow and a branch in Dubai.