mishap vs luck

mishap and luck both are nouns.

Word	Noun	Adjective	Verb	Adverb
mishap	Yes	No	No	No
luck	Yes	No	No	No

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

mishap: an unpredictable outcome that is unfortunate
luck: an unknown and unpredictable phenomenon that causes an event to result one way rather than another

Other hypernyms of mishap include chance, fortune, hazard.

mishap (noun)	luck (noun)
an instance of misfortune	an unknown and unpredictable phenomenon that causes an event to result one way rather than another
an unpredictable outcome that is unfortunate	an unknown and unpredictable phenomenon that leads to a favorable outcome
	your overall circumstances or condition in life (including everything that happens to you)