catastrophe vs misfortune

catastrophe and misfortune both are nouns.

Word	Noun	Adjective	Verb	Adverb
catastrophe	Yes	No	No	No
misfortune	Yes	No	No	No

As nouns, misfortune is a hypernym of catastrophe; that is, misfortune is a word with a broader meaning than catastrophe:

catastrophe: an event resulting in great loss and misfortune
misfortune: unnecessary and unforeseen trouble resulting from an unfortunate event

Other hypernyms of catastrophe include bad luck.

catastrophe (noun)	misfortune (noun)
an event resulting in great loss and misfortune	unnecessary and unforeseen trouble resulting from an unfortunate event
a sudden violent change in the earth's surface	an unfortunate state resulting from unfavorable outcomes
a state of extreme (usually irremediable) ruin and misfortune