cataclysm vs bad luck

cataclysm and bad luck both are nouns.

Word	Noun	Adjective	Verb	Adverb
cataclysm	Yes	No	No	No
bad luck	Yes	No	No	No

As nouns, bad luck is a hypernym of cataclysm; that is, bad luck is a word with a broader meaning than cataclysm:

cataclysm: an event resulting in great loss and misfortune
bad luck: unnecessary and unforeseen trouble resulting from an unfortunate event

Other hypernyms of cataclysm include misfortune.

cataclysm (noun)	bad luck (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 unpredictable outcome that is unfortunate
	an unfortunate state resulting from unfavorable outcomes