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.
anga
noun. iron
angaina
adjective. of iron
tong??a
adjective. of iron
tongo
noun. iron
yeraina
adjective. of iron
yereva
adjective. of iron
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 rejected and hard-to-read word in the Qenya Lexicon of the 1910s glossed “of iron”, adjectival form of the also-rejected noun ᴱQ. tongo “iron” (QL/94).