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.
rod
noun. tube, stem
mandra
adjective. noble
sinc
noun. metal
A noun from the Gnomish Lexicon of the 1910s appearing as G. sinc “metal” (GL/67), clearly the cognate of ᴱQ. sink “mineral, gem, metal” from the root ᴱ√SINI (QL/83).
Neo-Sindarin: I would retain this word for purposes of Neo-Sindarin, but would revise its sense to ᴺS. sinc “mineral”, derived from the primitive form ✶sinki (PE17/108) which may itself mean “✱mineral”; see that entry for discussion. I would use N. tinc for “metal”.
teld
noun. roof
telthon
noun. roof
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.
The Gnomish Lexicon of the 1910s had G. rod “tube, stem” based on the early root ᴱ√roto “hollow” (GL/65; QL/80).
Neo-Quenya: In Tolkien’s later writings, √ROT still had similar meanings like “tunnel” (WJ/414; PM/365), so I would retain ᴺS. rod “tube, stem” for purposes of Neo-Sindarin, and use it for “✱pipe” as well.