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The Japanese word

祖母

is pronounced
sobo | そぼ
means
grand mother
Examples:
父の母は、私の祖母にあたります。
chichi no haha wa, watashi no sobo ni atari masu.
My father's mother is my grandma.
彼の母親は彼が小さいときに亡くなったので、お祖母さんが彼を育てた。
kare no hahaoya wa kare ga chīsai toki ni nakunatta node, obāsan ga kare o sodate ta.
His mother died when he was young, and his grandmother brought him up.
Examples sourced from tatoeba.org