An adjective in the Qenya Lexicon of the 1910s glossed “fiery” with variants sāra and sārea (the second added later) derived from the early root ᴱ√SAH(Y)A “be hot” (QL/81).
Early Quenya
ruin
noun. peace
qelme
noun. ruin, utter end, perdition, end, death
karne
adjective. red
lanta-
verb. to fall
sá
noun. fire
sár(e)a
adjective. fiery
tan(y)a
noun. fire
An element meaning “fire” in some early names: tanya in ᴱQ. Tanyasalpe (LT1/187), tana in ᴱQ. Tana Qentima equivalent of G. Tôn a Gwedrin “Tale-fire” (PE15/7; LT2/197), and possibly also in ᴱQ. Fatanyu “Hell” (GL/51). Tan(y)a is likely a derivative of the early root ᴱ√tan- (GL/69, 71).
uru
noun. fire
velka
noun. flame
A noun in the Gnomish Lexicon of the 1910s glossed “a flame” derived from the early root ᴱ√(M)BELEKE (GL/22).
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”.