All 4 Uses

arbor
in
Words by Heart
(Edited)

At the side of the house was a brush arbor, and out of its top stuck a little whittled windmill, rolling in the breeze like a crazed sunflower.
Chpt 6 *

arbor = a framework that supports climbing plants; or a shady rest area made by such a framework or by trees and shrubs
Someone in the arbor was using a grindstone, hidden by the propped branches of willow still shaggy with dry leaves.
Chpt 6
Then the grinding stopped, and Tater came out of the arbor holding a sickle.
Chpt 6
She thought of the little windmill at the corner of the Haneys' brush arbor that he must have made.
Chpt 13

Definitions:

(1) (arbor as in: shaded arbor)
a framework that supports climbing plants; or a shady rest area made by such a framework or by trees and shrubs

The framework of an arbor is generally thought of as a wood lattice made to support vines, but it can also be a natural framework such as trees.
(2) (meaning too rare to warrant focus)
Less commonly arbor can be used as a proper noun to reference a location such as Ann Arbor, Michigan. As a common noun, it can also reference various types of rotating machine shafts.