Gnomish
tambin
adjective. of copper
tambos
noun. cauldron
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 noun appearing as G. tambos “a cauldron” in the Gnomish Lexicon of the 1910s (GL/69). It is likely based on the early root ᴱ√TAMA “beat; smelt, forge” referring to the cauldron’s construction from beaten metal (QL/88).
Neo-Sindarin: The root √TAM appeared in Tolkien’s later writing in connection to craft words, so I would retain and adapt this word as ᴺS. tammos “cauldron” for purposes of Neo-Sindarin.