tough luck vs destiny

tough luck and destiny both are nouns.

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

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

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

Other hypernyms of tough luck include circumstances, fate, fortune, lot, luck, portion.

tough luck (noun)	destiny (noun)
an unfortunate state resulting from unfavorable outcomes	an event (or a course of events) that will inevitably happen in the future
	the ultimate agency regarded as predetermining the course of events
	your overall circumstances or condition in life (including everything that happens to you)