victor vs medallist

victor and medallist both are nouns.

Word	Noun	Adjective	Verb	Adverb
victor	Yes	No	No	No
medallist	Yes	No	No	No

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

Other hyponyms of victor include contestee, medalist, upsetter, walloper.

victor (noun)	medallist (noun)
the contestant who wins the contest	(golf) the winner at medal play of a tournament
a combatant who is able to defeat rivals	someone who has won a medal