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.
muin
adjective. safe, secure
muin
noun. kine, cattle
A word in the Gnomish Lexicon of the 1910s glossed “kine, cattle”, apparently a collective noun related to G. mû “ox” (GL/58).
cwist
noun. secret
mu
preposition. will, am going to, am about to
mugwen
adjective. secret
mutha
preposition. will, am going to, am about to
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.
An adjective appearing in the Gnomish Lexicon of the 1910s as G. muin “safe, secure” with a variant form muim added and deleted (GL/58).