nonstarter vs loser

nonstarter and loser both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonstarter	Yes	No	No	No
loser	Yes	No	No	No

As nouns, nonstarter and loser are synonyms defined as:

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

Other synonyms of nonstarter include failure, unsuccessful person.

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