How do you write grandfather in greek?

The Greek word for grandfather depends on whether you're referring to your father's father or your mother's father.

* Παππούς (pappoús): This is the most common and generally accepted word for grandfather, regardless of whether it's your paternal or maternal grandfather. It's a more affectionate term.

* Πάππους (páppous): This is a less common variant of παππούς.

* Παππούλης (pappoulis): This is a diminutive of παππούς, a more endearing and affectionate term.

There isn't a direct equivalent that distinguishes between paternal and maternal grandfathers in the same way English does (grandfather vs. grandfather). You would need to add context to clarify which grandfather you mean if necessary.