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.
gen
noun. closed hand, grip
-gen
suffix. *earth
mútha-
verb. to depart, go, leave; (c. gen.) to leave the place of or time of speaker; to go forward
A verb in the Gnomish Lexicon of the 1910s with various glosses: “depart, go, leave”, “c. gen. leave the place of, time of, speaker”, and “go forward” (GL/58). Below it Tolkien wrote another word G. mu whose gloss may be “flow” or “from” according to the editors. This mu may be the basis of the verb mútha-, especially if mu means “from”.
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.
An unglossed suffix in the Gnomish Lexicon of the 1910s, final element of G. grosgen “soil”, and cognate to ᴱQ. kēmi “earth, soil, land” (GL/42), and so probably derived from the root ᴱ√KEME “soil” (QL/46).