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.

Gnomish

singrin

adjective. salt

A word appearing as G. singrin “salt (aj.)” in the Gnomish Lexicon of the 1910s, an adjective form of G. sing “salt” (GL/67).

Neo-Sindarin: I’d adapt this word as ᴺS. singren “salt[y]” for purposes of Neo-Sindarin using a more common Sindarin adjective suffix.

sing

noun. salt

A noun appearing as G. sing “salt” in the Gnomish Lexicon of the 1910s (GL/67), clearly the cognate of ᴱQ. singe “salt” and hence derived from the early root ᴱ√SIŊI (QL/83).

Neo-Sindarin: I’d retain ᴺS. sing “salt” for purposes of Neo-Sindarin as a derivative of the Neo-Root ᴺ√SIÑGI.

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.