ill luck vs fortune

ill luck and fortune both are nouns.

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

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

ill luck: an unfortunate state resulting from unfavorable outcomes
fortune: your overall circumstances or condition in life (including everything that happens to you)

Other hypernyms of ill luck include circumstances, destiny, fate, lot, luck, portion.

ill luck (noun)	fortune (noun)
an unfortunate state resulting from unfavorable outcomes	an unknown and unpredictable phenomenon that causes an event to result one way rather than another
	an unknown and unpredictable phenomenon that leads to a favorable outcome
	a large amount of wealth or prosperity
	your overall circumstances or condition in life (including everything that happens to you)