quenya_grammar1-4  Exercise 1: Singular Cases
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              cirya "ship"   lassë "leaf"
  Nominative  cirya          lassë
  Accusative  ciryá          lassé
  Genitive    ciryo          lassëo
  Dative      ciryan         lassen

(All attested in the Plotz paradigm as reported on Wikipedia.)

In everyday Quenya (Tarquesta) the accusative is the same as the nominative,
so cirya and lassë serve for both. The long-vowel accusative (ciryá, lassé)
belongs to the formal register. The genitive and dative differ from the
nominative in both registers.