Early Quenya
qelme
noun. ruin, utter end, perdition, end, death
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun appearing as ᴱQ. qelme “ruin, utter end, perdition, end, death” in the Qenya Lexicon of the 1910s under the early root ᴱ√QELE “perish, die, decay, fail” (QL/76).
Neo-Quenya: The root √KWEL “fade, die away, grow faint” survives in Tolkien’s later writings, so I would retain ᴺQ. quelmë “ruin, utter end, perdition” for purposes of Neo-Quenya, but would use other words for “death” and “end”.