Gnomish
nert
noun. prowess, a feat, strength
gwega nert
*strength of man
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.
nert
noun. prowess, a feat, strength
gwega nert
*strength of man
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 in the Gnomish Lexicon of the 1910s glossed “prowess, a feat, strength” based on the early root ᴱ√NERE having to do with manliness (GL/60).