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

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