champion

Synonyms: blue-ribbon boss capital chief choice cool dandy distinguished first greatest head illustrious out of sight out of this world outstanding premier prime principal prize-winning splendid super superior tip top top drawer topflight top-notch tops unbeaten undefeated world class

Antonyms: poorest worst

Synonyms: advocate ally backer challenger champ conqueror defender endorser exponent expounder guardian hero heroine medalist nonpareil number one numero uno paladin partisan patron proponent protector supporter sympathizer the greatest titleholder top dog upholder vanquisher victor vindicator warrior winner

Antonyms: loser

Synonyms: back battle contend defend espouse fight for go to bat for patronize plead for promote put in a good word for ride shotgun for side with stand behind stand up for support thump for uphold

Antonyms: be against oppose