disaster vs calamity

disaster and calamity both are nouns.

Word	Noun	Adjective	Verb	Adverb
disaster	Yes	No	No	No
calamity	Yes	No	No	No

As nouns, disaster and calamity are synonyms defined as:

Other synonyms of disaster include cataclysm, catastrophe, tragedy.

disaster (noun)	calamity (noun)
an act that has disastrous consequences	an event resulting in great loss and misfortune
an event resulting in great loss and misfortune
a state of extreme (usually irremediable) ruin and misfortune