Middle Primitive Elvish
ak
root. narrow, confined
akrā
adjective. narrow
khan(ak)
root. giant
glā
noun. radiance
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 in The Etymologies of the 1930s glossed “narrow, confined”, with the derived adjectives ᴹQ. arka and N. agor of similar meaning. It was the basis of the name Aglon meaning “Narrow Pass”, which continued to appear in Silmarillion narratives of the 1950s and 60s (WJ/38, 77). It might also be a factor in the later root √AKAS “neck, ridge” from the 1960s (PE17/92).