failure vs unfortunate

failure and unfortunate both are nouns.

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

As nouns, unfortunate is a hypernym of failure; that is, unfortunate is a word with a broader meaning than failure:

Other hypernyms of failure include unfortunate person.

failure (noun)	unfortunate (noun)
an act that fails	a person who suffers misfortune
an unexpected omission
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

failure (adjective)	unfortunate (adjective)
	not favored by fortune; marked or accompanied by or resulting in ill fortune
	not auspicious; boding ill
	unsuitable or regrettable