ill luck vs hardship

ill luck and hardship both are nouns.

Word	Noun	Adjective	Verb	Adverb
ill luck	Yes	No	No	No
hardship	Yes	No	No	No

As nouns, hardship is a hyponym of ill luck; that is, hardship is a word with a more specific, narrower meaning than ill luck:

Other hyponyms of ill luck include weakness, adversity, hard knocks, gutter, sewer, toilet, hard cheese.

ill luck (noun)	hardship (noun)
an unfortunate state resulting from unfavorable outcomes	something hard to endure
	something that causes or entails suffering
	a state of misfortune or affliction