good luck vs luckiness

good luck and luckiness both are nouns.

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

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

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

Other synonyms of good luck include good fortune.

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