Early Quenya
úrin
proper name. Sun, (lit.) Fire
úrin
adjective. (blazing) hot
ûr
proper name. Sun, (lit.) 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.
Name of the Sun in the earliest Lost Tales (LT1/187), sometimes appearing as úri (MC/214, 221), derived from the root ᴱ√URU having to do with heat (QL/98).