champion
cham-pi-on
noun
A person who has defeated all rivals in a competition or contest.
"He is the reigning world boxing champion."
verb
To vigorously support, defend, or advocate for a person, cause, or principle.
"The charity champions the rights of children."
adjective
(Informal, British) Excellent, superb, or first-rate.
"That was a champion effort, well done!"
noun
A person who vigorously supports or defends a cause or another person.
"She became a champion of human rights."
Thesaurus
Synonyms: prizewinning, best, admirer, protagonist, friend, supporter, booster, defend, title-holder, champ, wiz, adept