good fortune vs circumstances

good fortune and circumstances both are nouns.

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

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

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

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

good fortune (noun)	circumstances (noun)
a stroke of luck	a person's financial situation (good or bad)
an auspicious state resulting from favorable outcomes	your overall circumstances or condition in life (including everything that happens to you)