unfortunate vs unsuccessful

unfortunate is a noun but unsuccessful is not a noun.

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

unfortunate (noun)	unsuccessful (noun)
a person who suffers misfortune

unfortunate (adjective)	unsuccessful (adjective)
not favored by fortune; marked or accompanied by or resulting in ill fortune	not successful; having failed or having an unfavorable outcome
not auspicious; boding ill	failing to accomplish an intended result
unsuitable or regrettable