Early Primitive Elvish
dyeðe
root. DYEÐE
yere(ne)
root. *iron
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.
This root appeared in two different forms in the Qenya Lexicon of the 1910s: as ᴱ√DYEÐE = ‘EÐE equivalent of ᴱQ. anga “iron” (QL/105), and as ERE(N) “iron or steel” = ᴱ√YEREN (QL/36). In the contemporaneous Gnomish Lexicon Tolkien had related forms G. ger “ore, metal” and G. geth “ore of metals (esp. raw iron)” (GL/38); the second of these was deleted, which probably means Tolkien selected ᴱ√YEREN over ᴱ√DYEÐE. In Tolkien’s later writing he largely used √ANGA for “iron”.
Neo-Eldarin: In a 2024-08-17 post in the Vinyë Lambengolmor Discord Server (VLDS), Luinyelle suggested restoring ᴺQ. yeren “pig iron” with the added meaning “✱ore”, which also implies the preservation of ᴺS. [G.] ger “ore, [unrefined] metal”. Presumably these words would be derived from a Neo-Root ᴺ√GYEREN of similar meaning.