郷愁
きょうしゅう · kyoushuu · JLPT N1 · noun
homesickness
愁 — autumn 秋 (top) + heart 心 (bottom)
A semantic compound combining 秋 (autumn) above 心 (heart). Autumn, with its withering leaves and fading light, traditionally evoked melancholy in Chinese poetry, so 'autumn over the heart' came to mean sorrow, worry, or anxiety. 秋 also hints at the sound.