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