fortune vs tough luck

fortune and tough luck both are nouns.

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

As nouns, tough luck is a hyponym of fortune; that is, tough luck is a word with a more specific, narrower meaning than fortune:

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

Other hyponyms of fortune include good fortune, good luck, luckiness, providence, bad luck, ill luck, misfortune, failure.

fortune (noun)	tough luck (noun)
an unknown and unpredictable phenomenon that causes an event to result one way rather than another	an unfortunate state resulting from unfavorable outcomes
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)