See nonpareil in Webster's New World Roget's A-Z Thesaurus II
adjective
Without equal or rival:
alone, incomparable, matchless, only, peerless, singular, unequaled, unexampled, unique, unmatched, unparalleled, unrivaled. See same
noun
A person or thing so excellent as to have no equal or match:
nonesuch, paragon, phoenix. See good
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