visitation vs calamity

visitation and calamity both are nouns.

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

As nouns, calamity is a hypernym of visitation; that is, calamity is a word with a broader meaning than visitation:

Other hypernyms of visitation include cataclysm, catastrophe, disaster, tragedy.

visitation (noun)	calamity (noun)
an official visit for inspection or supervision	an event resulting in great loss and misfortune
an annoying or frustrating or catastrophic event
any disaster or catastrophe