unsuccessful person vs nonstarter

unsuccessful person and nonstarter both are nouns.

Word	Noun	Adjective	Verb	Adverb
unsuccessful person	Yes	No	No	No
nonstarter	Yes	No	No	No

As nouns, unsuccessful person and nonstarter are synonyms defined as:

unsuccessful person and nonstarter: a person with a record of failing; someone who loses consistently

Other synonyms of unsuccessful person include failure, loser.

unsuccessful person (noun)	nonstarter (noun)
a person with a record of failing; someone who loses consistently	a horse that fails to run in a race for which it has been entered
	a person with a record of failing; someone who loses consistently