The oak (there are several species) is usually grown as a long-lived, hardwood tree. If oak is growing in a mixed hedge, annual hedge cutting will force the oak to grow more like a shrub.
An oak is a tree.
Tree
Oak
Is banyan a shrub or tree
Lemon plant is a tree, where the lemon fruits are growing. Those lemons, what we buy in grocery stores.
Is banyan a shrub or tree
it is a shrub
shrub
shrub
shrub
shrub
It is a fungus.
The Esperanto words for tree and shrub are arbo and arbusto.