good luck vs fortune

good luck and fortune both are nouns.

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

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

good luck: a stroke of luck
fortune: an unknown and unpredictable phenomenon that leads to a favorable outcome

Other hypernyms of good luck include luck.

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

good luck: an auspicious state resulting from favorable outcomes
fortune: your overall circumstances or condition in life (including everything that happens to you)

Other hypernyms of good luck include circumstances, destiny, fate, lot, luck, portion.

good luck (noun)	fortune (noun)
an unexpected piece of good luck	an unknown and unpredictable phenomenon that causes an event to result one way rather than another
a stroke of luck	an unknown and unpredictable phenomenon that leads to a favorable outcome
an auspicious state resulting from favorable outcomes	a large amount of wealth or prosperity
	your overall circumstances or condition in life (including everything that happens to you)