contestee vs winner

contestee and winner both are nouns.

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

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

contestee: a winner (of a race or an election etc.) whose victory is contested
winner: the contestant who wins the contest

Other hypernyms of contestee include victor.

contestee (noun)	winner (noun)
a winner (of a race or an election etc.) whose victory is contested	the contestant who wins the contest
	a gambler who wins a bet
	a person with a record of successes