prosperity vs good fortune

prosperity and good fortune both are nouns.

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

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

Other hypernyms of prosperity include good luck, luckiness.

prosperity (noun)	good fortune (noun)
the condition of prospering; having good fortune	a stroke of luck
an economic state of growth with rising profits and full employment	an auspicious state resulting from favorable outcomes