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!

Gnomish

pruin

noun. charcoal

A noun appearing as G. pruin “charcoal” in the Gnomish Lexicon of the 1910s (GL/64) probably related to the early root ᴱ√PUŘU “consume by fire” [PUÐU] (QL/75). Its gloss was deleted.

Neo-Sindarin: I think this word is worth salvaging in Neo-Sindarin, reconceived of as a derivative of an augmented variant of the later root √RUY “blaze (red)”.