害
がい · gai · JLPT N3 · noun
injury
🐛 Sounds like guy: the bad guy who does harm and damage
害 = 宀 roof + 口 mouth, with strokes in between: harmful words spoken under your own roof. It shows up in 害虫 (gaichū, pest insect), 被害 (higai, damage suffered) and 公害 (kōgai, pollution).
害 — 宀 roof + 丯 (phonetic) + 口 mouth
Originally an ideograph showing harm spoken under a roof, with 宀 (roof/house) on top, a phonetic element 丯 in the middle, and 口 (mouth) below suggesting harmful speech. Over time it shifted from 'injury caused by words' to the broader senses of 'harm,' 'injure,' and 'fear.'