See champion in Webster's New World Roget's A-Z Thesaurus II
adjective
Exceptionally good of its kind:
ace, banner, blue-ribbon, brag, capital, excellent, fine1, first-class, first-rate, prime, quality, splendid, superb, superior, terrific, tiptop, top. (Informal) A-one, bully, dandy, great, swell, topflight, topnotch. (Slang) boss. (Chiefly British) tophole. See good
verb
To aid the cause of by approving or favoring:
advocate, back, endorse, get behind, plump for, recommend, side with, stand behind, stand by, support, uphold. Idioms: align oneself with, go to bat for, take the part of. See support
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