The word "vacuous" is not a biological term and doesn't refer to any part of a plant or animal cell. It means empty or lacking in intelligence.

Perhaps you're thinking of vacuole, which is a cellular organelle found in both plant and animal cells.

Here's the difference:

* Vacuoles: These are membrane-bound sacs within a cell that store water, nutrients, and waste products. They play a crucial role in maintaining cell turgor (rigidity), providing structural support, and regulating the internal environment of the cell.

* Vacuous: This word describes a state of emptiness or lack of thought.

Let me know if you have any other questions about cell biology.