Qenya
andon
noun. great gate, great gate, [ᴱQ.] door, gate
kala
noun. light
kalina
adjective. light
kalma
noun. light, lamp
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 noun for a “great gate” in The Etymologies of the 1930s, an augmentative form of ᴹQ. ando “gate” under the root ᴹ√AD “entrance, gate” (Ety/AD).
Conceptual Development: The word ᴱQ. andon first appeared in the Early Noldorin Dictionary of the 1920s as a cognate of ᴱN. ann “door” (PE13/137, 160). It was also an element in the name ᴱQ. Andonavestan “Gates of Summer” (PE13/143, 160). This earlier iteration was not augmentative as it was in the 1930s.