ruinë noun "a fire, a blaze" (PE17:183). Compare nárë.
Quenya
tan-
verb. to make, fashion
ruinë
fire, a blaze
sá
fire
sá noun "fire" (LT1:265; "Qenya" spelling sâ. Rather nárë in LotR-style Quenya.)
uru
fire
uru noun "fire" (LT1:271)
úr
fire
úr noun "fire" (UR)This stem was struck out in Etym, but a word that must be derived from it occurs in LotR, so it seems that Tolkien restored it. Early "Qenya" also has Ûr, noun "the Sun" (also Úri, Úrinci ("k"), Urwen) (LT1:271). Cf. Úri.
A neologism in ABNW (ABNW) from the early 2000s based on ᴹ√TAN “make, fashion”. This root became √TAM in notes published after ABNW, so I would instead use attested cat- “shape, fashion”, also published after ABNW.