Word

高祖父

こうそふ
great-great-grandfather
Word

皇祖

こうそ
(divine, historical or legendary) founder of an empire
Word

御祖師様

おそしさま
the Founder of the (our) sect (used especially in the Nichiren sect of Buddhism, referring to Nichiren)
Word

御高祖頭巾

お高祖頭巾
おこそずきん
kerchief worn by women in former times in Japan in cold weather, covering the whole head (except eyes)
Word

外祖母

がいそぼ
maternal grandmother
Word

先の祖

さきのおや
ancestor
Word

遠祖

えんそ
forefathers; remote ancestors
Word

印欧祖語

いんおうそご
Proto-Indo-European (hypothetical language from which all Indo-European languages are derived)
Word

医学の祖

いがくのそ
founder of medical science
Word

お婆ちゃん

お祖母ちゃん、御祖母ちゃん、御婆ちゃん
おばあちゃん
granny; grandma; gran; female senior-citizen