loser vs nonstarter

loser and nonstarter both are nouns.

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

As nouns, loser and nonstarter are synonyms defined as:

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

Other synonyms of loser include failure, unsuccessful person.

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