What is the greek phonetic word for grandfather?

There isn't one single Greek word for "grandfather" that perfectly maps to the English phonetic pronunciation. The Greek words for grandfather vary depending on the dialect and the level of formality.

The most common words and their approximate pronunciations (remember that pronunciation in Greek is nuanced and varies regionally) are:

* Παππούς (pappús): This is a common and widely understood term, pronounced roughly as "pap-POOS" (the stress is on the second syllable).

* Παππούλης (pappúlis): This is a more diminutive and affectionate form of "παππούς," pronounced similarly to "pap-POO-lees."

* Κυριούλης (kyrioúlis): This translates more literally to "little master" or "dear master," and can be used as an affectionate term for grandfather. Pronounced roughly "kee-ree-OO-lees."

Therefore, there's no single "phonetic word," but rather several options with slightly different connotations and pronunciations.