See decease in Webster's New World Roget's A-Z Thesaurus II
verb
To cease living:
demise, depart, die, drop, expire, go, pass away, pass (on), perish, succumb. (Informal) pop off. (Slang) check out, croak, kick in, kick off. Idioms: bite the dust, breathe one's last, cash in, give up the ghost, go to one's grave, kick the bucket, meet one's end (or Maker), pass on to the Great Beyond, turn up one's toes. See live
noun
The act or fact of dying:
death, demise, dissolution, extinction, passing, quietus, rest1. (Slang) curtain (used in plural). See live
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