This is the 93rd most frequent Vietnamese word.
ông
"Ông" is a Vietnamese term meaning grandfather, elder man, or a respectful title for an older male.
"Ông ấy" is used as a polite term for addressing or referring to an older gentleman.
Ông ấy là giáo viên.
He is a teacher.
"Ông ngoại" specifically means maternal grandfather, showing the familial context of "ông".
Ông ngoại của tôi sống ở nông thôn.
My maternal grandfather lives in the countryside.
"Ông" here is a formal way of addressing an older man, often used in a respectful or formal conversational context.