頭脳
ずのう · zunou · JLPT N2 · noun
brains
🧠 頭 = head + 脳 = brain: two words for the same organ, combined to mean intellect
Both kanji name the head and the brain, so the compound stresses the thinking organ itself. It is used for sharp minds, like 頭脳明晰 for clear-headed intelligence. Its on'yomi reading is zunou.