You may say "ojiisan," "jiichan," or "sofu."
The Japanese word for grandfather is ojiisan. Phonetically, you'd pronounce it "oh-jee-sahn".
Ojiisan is the polite way to say "grandfather". You'd use it when referring to someone else's grandfather. The humble way of referring to your own grandfather in Japanese is sofu.
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'grandfather' is 'Ojiisan' or 'Ojiichan' in japanese. But in a very formal written format, it is 'sofu'.
Grandma is obaasan (おばあさん), not to be mistaken with obasan which is aunt or a way of addressing older women.
For someone else's grandfather, and when addressing your own grandfather: ojiisan, おじいさん
For your own grandfather: sofu, そふ
The Japanese word for grandfather is ojiisan. Phonetically, you'd pronounce it "oh-jee-sahn".