Gnomish
gam
noun. shout
gam(m)a-
noun/verb. gain, profit, interest (on moneys), increase; to be profitable, bring in revenue; to gain
gama-
verb. to call, shout to
auba
noun. shout
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 word appearing as G. {gamba- >>} gama- or gamma- in the Gnomish Lexicon of the 1910s, appearing twice with two different translations: “gain, profit, interest (on moneys), increase” and “to be profitable, bring in revenue; (tr.) to gain” (GL/37). The first set of glosses may be as a noun, despite the “-” at the end of the word form. These words may be related to the early root ᴱ√yṇt from which the adverb G. gantha “more” was derived.
Neo-Sindarin: I would adapt this as a verb ᴺS. ganna- “gain; be profitable, bring in revenue” based on the Neo-Root ᴺ√GYANTA having to do with increase.