luckiness vs good fortune

luckiness and good fortune both are nouns.

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

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

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

Other synonyms of luckiness include good luck.

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