good fortune vs destiny

good fortune and destiny both are nouns.

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

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

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

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

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