一利一害[ichiriichigai] advantages and disadvantages
煙害[engai] smoke pollution
加害[kagai] assault
加害者[kagaisha] assailant
禍害[kagai] evil

害悪[gaiaku] harm
害虫[gaichuu] harmful insect
害鳥[gaichou] vermin
害毒[gaidoku] harm

碍子[gaishi] insulator
傘形碍子[kasagatagaishi] umbrella insulator
障碍[shougai] obstacle
阻碍[sogai] obstruction
低障碍[teishougai] low hurdles

妨碍[bougai] disturbance
無碍[muge] free from obstacles
融通無碍[yuuzuumuge] free, unfettered and flexible
障碍者[shougaisha] (physically) handicapped person

障礙[shougai] obstacle
阻礙[sogai] obstruction
妨礙[bougai] disturbance
無礙[muge] free from obstacles

融通無礙[yuuzuumuge] free, unfettered and flexible
障礙者[shougaisha] (physically) handicapped person
縦横無礙[juuoumuge] being as free as the air

エンジン故障[enjinkoshou] engine failure
安全保障[anzenhoshou] security guarantee (e.g. military security, network security, etc.)
安全保障条約[anzenhoshoujouyaku] US-Japan Security Treaty
画障[gashou] pictured paper doors
気に障る[kinisawaru] to hurt one's feelings

気障[kiza] affected
血行障害[kekkoushougai] disturbance (blockage) of blood flow
故障[koshou] break-down
黒内障[kokunaishou] black cataract
差し障り[sashisawari] offence