winner vs gambler

winner and gambler both are nouns.

Word	Noun	Adjective	Verb	Adverb
winner	Yes	No	No	No
gambler	Yes	No	No	No

As nouns, gambler is a hypernym of winner; that is, gambler is a word with a broader meaning than winner:

winner: a gambler who wins a bet
gambler: a person who wagers money on the outcome of games or sporting events

winner (noun)	gambler (noun)
the contestant who wins the contest	a person who wagers money on the outcome of games or sporting events
a gambler who wins a bet	someone who risks loss or injury in the hope of gain or excitement
a person with a record of successes