• 害虫がいちゅう — harmful insect
• 公害こうがい — pollution
• 災害さいがい — disaster
• 障害しょうがい — obstacle / disorder
• 被害ひがい — damage / suffering
• 加害者かがいしゃ — perpetrator

The top 宀 suggests a roof or house, while the lower part 豈 (phonetic + meaning hint) relates to misfortune. 害 has long conveyed the sense of injury or harm — both physical and psychological. In modern usage, it's often part of legal or social terms.