luckiness vs good luck

luckiness and good luck both are nouns.

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

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

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

Other synonyms of luckiness include good fortune.

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