厄 （ヤク） misfortune, bad luck, evil, disaster, unlucky year, critical year, smallpox

厄年 （ヤクドシ） unlucky year, critical year, year (esp. age 25 and 42 for men, 19 and 33 for women) that is considered unlucky (orig. in Onmyōdō), bad year, annus horribilis

災厄 （サイヤク） calamity, disaster, accident

大厄 （タイヤク） calamity, disaster, great misfortune, grand climacteric