misfortune vs ill luck

misfortune and ill luck both are nouns.

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

As nouns, misfortune and ill luck are synonyms defined as:

misfortune and ill luck: an unfortunate state resulting from unfavorable outcomes

Other synonyms of misfortune include bad luck, tough luck.

misfortune (noun)	ill luck (noun)
unnecessary and unforeseen trouble resulting from an unfortunate event	an unfortunate state resulting from unfavorable outcomes
an unfortunate state resulting from unfavorable outcomes