mishap vs misfortune

mishap and misfortune both are nouns.

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

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

mishap: an instance of misfortune
misfortune: unnecessary and unforeseen trouble resulting from an unfortunate event

Other hypernyms of mishap include bad luck.

mishap (noun)	misfortune (noun)
an instance of misfortune	unnecessary and unforeseen trouble resulting from an unfortunate event
an unpredictable outcome that is unfortunate	an unfortunate state resulting from unfavorable outcomes