Nouns

(n)ideal, paragon, nonpareil, saint, apotheosis, nonesuch, nonsuchmodel of excellence or perfection of a kind; one having no equal
(n)nonpareilcolored beads of sugar used as a topping on e.g. candies and cookies
(n)nonpareila flat disk of chocolate covered with beads of colored sugar

Adjectives

(s)matchless, nonpareil, one, one and only, peerless, unmatched, unmatchable, unrivaled, unrivalledeminent beyond or above comparison“matchless beauty”, “the team's nonpareil center fielder”, “she's one girl in a million”, “the one and only Muhammad Ali”, “a peerless scholar”, “infamy unmatched in the Western world”, “wrote with unmatchable clarity”, “unrivaled mastery of her art”