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.
nithla
noun. candlestick
nitha
noun. a candle
A noun appearing as {nithla >>} nitha “a candle” in Gnomish Lexicon of the 1910s, an elaboration of G. nith “wax” (GL/60). According to the editors, the deletion of the l might have been a smudge, but this word was followed by another one: G. {nithlafast >>} nithla “candlestick”. This supports the notion that “candle” was revised to nitha.
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 noun appearing as {nithlafast >>} nithla “candlestick” in Gnomish Lexicon of the 1910s, based on G. {nithla >>} nitha “candle” (GL/60). The second element of the deleted form was the (also deleted) word G. fast “holder, stand” (GL/33).