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.
gwidh-
verb. to weave (tr.)
gwidh-a-ging
noun. cobweb
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.
The Gnomish Lexicon of the 1910s had the verb G. gwidh- “weave (tr.)” based on the early root ᴱ√gu̯iđ (GL/46).
Neo-Sindarin: I’d update this verb to ᴺS. gwir- “to weave” based on the later weaving root √WIR (PE17/191; VT39/10). Fiona Jallings previously suggested ᴺS. gwer- “to weave, wind, spin, twist” based on √WER “weave” (PE17/33) and inspired by G. gwer- “weave, wind” (PE15/27), but √WER is from around 1957 and is not compatible with Q. Vairë “Weaver”, so I prefer the 1959-60 form of the root: √WIR.