I.
noun
ADJECTIVE
▪ great , supreme , true , undisputed
▪ current , defending , reigning
▪
The reigning ~ will defend her title tonight.
▪ former , past
▪ undefeated
▪ three-time , etc.
▪ all-around ( AmE ), national , state , world
▪ junior
▪ Olympic
▪
the Olympic skating ~
▪ boxing , chess , etc.
▪ heavyweight , middleweight , welterweight
VERB + CHAMPION
▪ become , be crowned , be named
▪
He was crowned ~ after his fight in Atlanta.
▪ beat , defeat
▪ decide , determine
▪
The two winners will move onto a one-game final to determine the ~.
CHAMPION + VERB
▪ defend her/his title
CHAMPION + NOUN
▪ fighter , jockey , sprinter , etc.
II.
verb
Champion is used with these nouns as the object: ↑ cause , ↑ interest , ↑ right