Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
loctha-
verb. to curl (tr.), bend, wind, twine, tie knot, tangle
loctha
noun. twist, tendril, spiral, coil
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.
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).
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”.