Early Primitive Elvish
puřu
root. consume by fire
puðu
root. consume by fire
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A root in the Qenya Lexicon of the 1910s given as ᴱ√PUŘU [PUÐU] “consume by fire” with derivatives like ᴱQ. pur “a fire, an artificial fire”, ᴱQ. purin “hearth” and ᴱQ. purya- “set fire to” (QL/75). There are no obvious derivatives in the contemporaneous Gnomish Lexicon (G. pruin “charcoal” might be related), but in Gnomish Lexicon Slips modifying that document, primitive G. bordd “fireplace” is compared to ✶búrı̯ā > ᴱQ. purya and seems to be derived from this root or a variant of it (PE13/116). It hints that the root might have been revised to ✱ᴱ√BUÐU or even ᴱ√BURU. After the 1910s, there are no signs of this root in Tolkien’s writing.