Gnomish
ruf-
verb. to tear
nien(n)
noun. tear
nîn
noun. tear
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.
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 appearing as G. ruf- “tear” in the Gnomish Lexicon of the 1910s (GL/66), perhaps based on the early root ᴱ√RUVU “burst asunder” (QL/81).
Neo-Sindarin: Since I retain this early root as ᴺ√RUB, I would retain and update this early word as ᴺS. rov- “to tear” to better fit Sindarin phonology.