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.
argulthion
adjective. equal, equivalent
feleg
adjective. equal
A noun appearing as G. feleg in the Gnomish Lexicon of the 1910s glossed {“probable, likely” >>} “equal”, an adjective form of G. fel “like” (GL/34).
Neo-Sindarin: Since I update G. fel to ᴺS. bîl “likeness, similarity”, I would update feleg to ᴺS. bíleb “equal”. I would further assume it means “equal but not identical, of the same nature or value”.
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 in the Gnomish Lexicon of the 1910s given as G. argulthion “equal, equivalent” combining G. ar- “beside” and G. gultha- “bear up” (GL/20, 38), so meaning something like “✱beside-bear-able”.
Neo-Sindarin: For purposes of Neo-Sindarin, I would update the word to ᴺS. asgolui “equivalent, (lit.) beside-bear-able” based on later √AS “beside” and √KOL “bear”.