Gnomish
fedhra-
verb. to unite in a band
gofedhra-
verb. to unite in a band
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.
The verb gofedhra- “to unite in a band” appeared in the Gnomish Lexicon of the 1910s, that was especially used reflexively (GL/40). It was a combination of G. go- “together” and the verb G. fedhra-, apparently of the same meaning (GL/34). The verb fedhra- in turn was related to words like G. fedhrog “one bound by oath” and G. fedhir “bond, convention, agreement”.