boon vs good fortune

boon and good fortune both are nouns.

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

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

Other hypernyms of boon include good luck, luckiness.

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

boon (adjective)	good fortune (adjective)
very close and convivial