any violent upheaval, esp. one of a social or political nature.

Physical Geography . a sudden and violent physical action producing changes in the earth's surface.

an extensive flood; deluge.

noun

boon , good fortune , happiness , miracle , wonder

noun

calamity , cataract , catastrophe , collapse , convulsion , crunch * , curtains * , debacle , deluge , disturbance , double trouble , flood , flooding , holy mess , inundation , misadventure , ruin , torrent , tragedy , unholy mess , upheaval , waterloo * , woe , alluvion , downpour , freshet , niagara , overflow , cemetery , crypt , disastrous , tomb , tragic , vault