Synonyms for Best include:
A-one, acceptable, ace, advisable, all-time, alone, apical, bang-up, banner, best, better, blue-ribbon, boss, brag, brilliant, bully, capital, champion, choice, corking, crack, cracking, crowning, dandy, excellent, extraordinary, fantabulous, fantastic, favorable, favourable, first, first-class, first-rate, foremost, gilt-edged, go-to-meeting, good, good enough, goodish, great, greatest, groovy, high, high-grade, high-performance, hot, incommensurable, incomparable, keen, matchless, neat, nifty, nonpareil, not bad, obedient, one, one and only, optimal, optimum, outstanding, peachy, peerless, premium, prime, primo, prize, prizewinning, prudent, pucka, pukka, quality, recommended, record-breaking, redeeming, respectable, satisfactory, second-best, select, shining, slap-up, smashing, solid, spiffing, sterling, suggested, Sunday-go-to-meeting, super, superb, superfine, superior, superlative, supreme, surpassing, swell, tiptop, top, top-flight, top-grade, top-hole, top-quality, topmost, topnotch, topping, tops, transcendent, uncomparable, unequaled, unequalled, unexceeded, unexcelled, unique, unmatchable, unmatched, unparalleled, unrivaled, unrivalled, unsurpassable, unsurpassed, upmost, upper, uppermost, weapons-grade, well, well behaved, well-behaved, well-made, wise, world-class
best is a ADJ.
best, better
best is a ADV.
Best, C. H. Best, Charles Herbert Best, topper
Best is a NOUN.
best, outdo, outflank, scoo, scoop, trump
best is a VERB.