winner vs highflyer

winner and highflyer both are nouns.

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

As nouns, highflyer is a hyponym of winner; that is, highflyer is a word with a more specific, narrower meaning than winner:

Other hyponyms of winner include first lady, great, highflier, natural, sleeper.

winner (noun)	highflyer (noun)
the contestant who wins the contest	a person of great ability and ambition
a gambler who wins a bet
a person with a record of successes