tough luck vs ill luck

tough luck and ill luck both are nouns.

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

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

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

Other synonyms of tough luck include bad luck, misfortune.

tough luck (noun)	ill luck (noun)
an unfortunate state resulting from unfavorable outcomes	an unfortunate state resulting from unfavorable outcomes