mischance vs near miss

mischance and near miss both are nouns.

Word	Noun	Adjective	Verb	Adverb
mischance	Yes	No	No	No
near miss	Yes	No	No	No

As nouns, near miss is a hyponym of mischance; that is, near miss is a word with a more specific, narrower meaning than mischance:

Other hyponyms of mischance include accident, derailment, ground loop, puncture, slip, trip, crash.

mischance (noun)	near miss (noun)
an instance of misfortune	an accidental collision that is narrowly avoided
an unpredictable outcome that is unfortunate