"champion" in the noun sense
1. champion, champ, title-holder
someone who has won first place in a competition
2. champion, fighter, hero, paladin
someone who fights for a cause
3. supporter, protagonist, champion, admirer, booster, friend
a person who backs a politician or a team etc.
"all their supporters came out for the game"
"they are friends of the library"
4. ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz
someone who is dazzlingly skilled in any field
"champion" in the verb sense
1. champion, defend
protect or fight for as a champion
"champion" in the adjective sense
1. champion, prizewinning
holding first place in a contest
"a champion show dog"
"a prizewinning wine"
Source: WordNet® (An amazing lexical database of English)
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