Gnomish
mu
preposition. [?] flow; from
mu
preposition. will, am going to, am about to
mutha
preposition. will, am going to, am about to
a
preposition. from
o
preposition. from
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 in the Gnomish Lexicon of the 1910s whose gloss may be “flow” or “from” according to the editors (GL/58). Above it Tolkien had a verb G. mútha- with glosses like “depart” and “go forward”. This verb might be based on mu, especially if mu means “from”.