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The Japanese word

祖父

is pronounced
sohu | そふ
means
grand father
Examples:
祖父が大事にしていた伊万里焼の皿は、ずっしりと重かった。
sofu ga daiji ni shi te i ta imariyaki no sara wa, zusshiri to omokatta.
The Imari porcelain plate that my father cherished was quite heavy.
父の父は祖父、祖父の父は曽祖父、曽祖父の父は高祖父だが、高祖父より前の世代の呼称は決まっていない。
chichi no chichi wa sofu, sofu no chichi wa so sofu, so sofu no chichi wa kōsofu da ga, kōsofu yori mae no sedai no koshō wa kimatte i nai.
The father of a father is a grandfather, a grandfather's father is a great-grandfather, a great-grandfather's father is a great-great-grandfather, but no word has been decided upon for the generations before great-great-grandfather.
Examples sourced from tatoeba.org