failure vs miscarriage

failure and miscarriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
failure	Yes	No	No	No
miscarriage	Yes	No	No	No

As nouns, miscarriage is a hyponym of failure; that is, miscarriage is a word with a more specific, narrower meaning than failure:

failure (noun)	miscarriage (noun)
an act that fails	a natural loss of the products of conception
an unexpected omission	failure of a plan
an event that does not accomplish its intended purpose
a person with a record of failing; someone who loses consistently
lack of success
loss of ability to function normally
inability to discharge all your debts as they come due