This is the 6952nd most frequent Turkish word.
ceviz
Walnut.
Here, 'ceviz' is used to refer to the nut, commonly called walnut.
Bu ceviz çok lezzetli.
This walnut is very delicious.
In this context, 'ceviz' is used to specify the type of tree: a walnut tree.
Ceviz ağacı bahçede büyüyor.
The walnut tree is growing in the garden.
In this example, 'ceviz' refers to the material, here specifically walnut wood.