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.

Gnomish

nud-

verb. to incline head, bend face down

A verb appearing as G. nud- “incline head, bend face down” in the Gnomish Lexicon of the 1910s (GL/61), probably based on the early root ᴱ√NUHU “bow, bend down; stoop, sink” (QL/68). There is a similar and probably-related verb G. nunta- “agree” appearing two lines below it.

Neo-Sindarin: For purposes of Neo-Sindarin, I would combine and adapt these verbs as ᴺS. nunna- “to incline head, bend face down, ✱nod; to assent, ✱agree” based on the later root √NU “sink, go down”, perhaps from primitive ✱nun-tā.

ther-

verb. to tie

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.

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.