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.
loctha
noun. twist, tendril, spiral, coil
loctha-
verb. to curl (tr.), bend, wind, twine, tie knot, tangle
A verb appearing as G. loctha- “curl (tr.), bend, wind, twine, tie knot, tangle” in the Gnomish Lexicon of the 1910s (GL/54), clearly based on the early root ᴱ√LOKO “twine, twist, curl” (QL/55).
Neo-Sindarin: Since √LOK “bend, loop” survived in Tolkien’s later writing, I would retain this word but update it to ᴺS. loetha- “to curl, bend, wind, twine” to better fit Sindarin phonology, dropping the meanings “tie knot, tangle” for which I would use [N.] nod- “tie” and [G.] canga- “tangle”.
gwert
noun. a twist
A word in the Gnomish Lexicon of the 1910s glossed “a twist”, a noun form of G. gwer- “wind, turn, bend” (GL/46).
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 appearing as G. loctha “a twist, tendril, spiral, coil” in the Gnomish Lexicon of the 1910s (GL/54), clearly based on the early root ᴱ√LOKO “twine, twist, curl” (QL/55).
Neo-Sindarin: Since √LOK “bend, loop” survived in Tolkien’s later writing, I would retain this word but update it to ᴺS. loeth “twist, tendril, spiral, coil” to better fit Sindarin phonology.