(D) A cataclysm is a particularly intense, severe, and overwhelming calamity.
CATACLYSM: any great upheaval that causes
sudden and violent changes, as an
earthquake or a war
UPHEAVAL: a sudden, violent change
Colossus: any huge or important person or thing [C3]
the gigantic statue of Apollo set at the
entrance to the harbor of Rhodes c. 280
B.C. and included among the Seven
Wonders of the World
Avalanche: a mass of loosened snow, earth, rocks,
etc. suddenly and swiftly sliding down a
mountain, often growing as it descends
Calamity: any extreme misfortune bringing great
loss and sorrow; disaster
Casualty: a) a member of the armed forces who is
lost to active service through being killed,
wounded, captured, interned, sick, or
missing b) [pl.] losses of personnel
resulting from death, injury, etc.