祖父
そふ · sofu · JLPT N4 · noun
grandfather
👴 祖父 = ancestor (祖) + father (父): the father one generation up
祖 means ancestor, as in 祖先 (sosen, ancestors); 父 means father. Sofu is the humble, formal word for your own grandfather; おじいさん is used for someone else's. Sound hook: so-fu, so far back a father.