Gnomish
gontha
noun. pillar, stele, memorial
gontha
noun. boy
gontha li dessa
boy and girl
taul
noun. pillar
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 noun appearing as G. gontha- “a pillar, stele, memorial” in the Gnomish Lexicon of the 1910s, an elaboration of G. gonn “stone” (GL/41). The reason for the “-” at the end of the word is unclear. This word was originally G. gontha- “boy”.
Neo-Sindarin: For purposes of Neo-Sindarin I would update this word to ᴺS. gonnoth “pillar, stele, memorial” with the augmentative suffix -oth, so originally “✱great stone”.