Early Quenya
ungweliante
feminine name. Great Spider Who Enmeshes
wirilóme
feminine name. Gloomweaver
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.
Another name for Ungweliante (S. Ungoliant) in the earliest Lost Tales (LT1/152), a combination of some form of the root ᴱ√GWIÐI having to do with weaving and lóme “gloom”, as suggested by Christopher Tolkien (LT1A/Gwerlum).