* Hydrogen oxide is the chemical name for water (H₂O). It's a neutral molecule.

* Hydroxide is a polyatomic ion with the formula OH⁻. It has a negative charge.

Here's the key difference:

* Hydrogen oxide (H₂O) is a molecule made up of two hydrogen atoms and one oxygen atom. It's a neutral compound.

* Hydroxide (OH⁻) is an ion made up of one oxygen atom and one hydrogen atom, carrying a negative charge. It's a charged species.

Hydroxide is a component of many chemical compounds, including bases and alkalis. When dissolved in water, hydroxide ions make the solution basic or alkaline.