Antonyms:

failure, loser, nonstarter, unsuccessful person

a person with a record of failing; someone who loses consistently

types:

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first lady

the leading woman in an art or profession

great

a person who has achieved distinction and honor in some field

highflier, highflyer

a person of great ability and ambition

natural

someone regarded as certain to succeed

sleeper

an unexpected achiever of success

type of:

individual, mortal, person, somebody, someone, soul

a human being

Antonyms:

also-ran, loser

a contestant who loses the contest

types:

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contestee

a winner (of a race or an election etc.) whose victory is contested

medalist, medallist

someone who has won a medal

upsetter

an unexpected winner; someone who defeats the favorite competitor

walloper

a winner by a wide margin

type of:

contestant

a person who participates in competitions

Antonyms:

loser

a gambler who loses a bet

types:

lottery winner, prize winner

the winner of a lottery

type of:

gambler

a person who wagers money on the outcome of games or sporting events