disaster vs hardship

disaster and hardship both are nouns.

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

As nouns, hardship is a hypernym of disaster; that is, hardship is a word with a broader meaning than disaster:

Other hypernyms of disaster include adversity, hard knocks.

disaster (noun)	hardship (noun)
an act that has disastrous consequences	something hard to endure
an event resulting in great loss and misfortune	something that causes or entails suffering
a state of extreme (usually irremediable) ruin and misfortune	a state of misfortune or affliction