Middle Primitive Elvish
er
root. one, only, be alone, deprived
rē/ere
root. bear, produce
anga
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.
A root appearing as {GERE/GRÉ >>} ERE/RÉ “bear, produce” in drafts for the first version of Quenya Personal Pronouns (QPP1) from the late 1940s, contrasted with masculine ᴹ√NŌ/ONO “beget” (PE23/87 note #85). In these rejected notes, RÉ was the basis for various feminine adjectives and NŌ the basis for various masculine adjectives. Elsewhere √NŌ was not specifically masculine, so I think this was a transient idea.