Gnomish
ther-
verb. to tie
meleth
noun. love
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.
ther-
verb. to tie
meleth
noun. love
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 verb in the Gnomish Lexicon of the 1910s glossed “to tie” (GL/72), probably based on the early root ᴱ√SERE “twine, tie, bind” from the contemporaneous Qenya Lexicon, whose true form was probably ✱ᴱ√ÞERE (QL/83). In Tolkien’s later writings, √THER was “sew”; see that entry for details.