The word **柱子 (zhùzi)**, meaning "pillar" or "column," is formed through a common Chinese morphological process where the core meaningful morpheme **柱 (zhù)**, which signifies the concept of a pillar, is combined with the suffix **子 (zi)**. This suffix **子** often functions as a nominalizer, transforming the bound root into a stand-alone, concrete noun and frequently adding a sense of familiarity or indicating a tangible object. Therefore, the formation is **Bound Root (柱) + Nominalizing Suffix (子) → Concrete Noun (柱子)**.