ill luck vs misfortune

ill luck and misfortune both are nouns.

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

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

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

Other synonyms of ill luck include bad luck, tough luck.

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