failure vs loser

failure and loser both are nouns.

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

As nouns, failure and loser are synonyms defined as:

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

Other synonyms of failure include nonstarter, unsuccessful person.

failure (noun)	loser (noun)
an act that fails	a gambler who loses a bet
an unexpected omission	a contestant who loses the contest
an event that does not accomplish its intended purpose	a person with a record of failing; someone who loses consistently
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