good fortune vs good luck

good fortune and good luck both are nouns.

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

As nouns, good fortune and good luck are synonyms defined as:

Other synonyms of good fortune include fluke.

As nouns, good fortune and good luck are synonyms defined as:

good fortune and good luck: an auspicious state resulting from favorable outcomes

Other synonyms of good fortune include luckiness.

good fortune (noun)	good luck (noun)
a stroke of luck	an unexpected piece of good luck
an auspicious state resulting from favorable outcomes	a stroke of luck
	an auspicious state resulting from favorable outcomes