suburbanization?

urbanization(urbanisation)＝urban encroachment？

suburbanization同urban encroachment既意思基本上係一樣既。

但係現在D人都不懂Urban Encroachment；有時如果我地用Urbanization, 連一個學生都明。而且，我覺得用urbanisation會專業D。

所以，我會建議你用urbanization。

urbanization是否等同urban encroachment?

Yes, it has the same meaning basicially.