serendipity vs good luck

serendipity and good luck both are nouns.

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

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

Other hypernyms of serendipity include fluke, good fortune.

serendipity (noun)	good luck (noun)
good luck in making unexpected and fortunate discoveries	an unexpected piece of good luck
	a stroke of luck
	an auspicious state resulting from favorable outcomes