祖 【ソ】 ancestor, forefather, progenitor, originator, pioneer,
inventor, founder, grandfather
祖国 【ソコク】 motherland, fatherland, native country
元祖 【ガンソ】 originator, pioneer, inventor, founder, progenitor,
primogenitor, founder of a family line
教祖 【キョウソ】 founder of a religious sect