(mathematics) panmagic square

(neuroscience) chemotransmitter

(neuroscience) neurotransmitter

radioactive material

橈骨: (anatomy) radius - (The long bone in the forearm, on the side of the thumb.) / 頭骨: (anatomy) skull, cranium - (The main bone of the head.)

投手: (baseball) pitcher / 党首: (politics) party leader / 当主: a head of family / 頭首: a head of group

順当: proper, right, reasonable

討議: debate

討議: debate, discussion / 闘技: competition, contest / 党議: party council

番頭: head clerk, general manager / 晩稲: late-growing rice, late-blooming flowers / 晩冬: late winter / 蟠桃: Saturn peach, donut peach