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.
silta
noun. sieve
silt-
verb. to sift, sort out, winnow
A verb appearing as ᴱQ. silt- “sort out, sift, winnow” in the Qenya Lexicon of the 1910s based on the early root ᴱ√SḶTḶ (QL/84). The verb form silte reappeared in the Early Qenya Grammar (EQG) of the 1920s derived from primitive ᴱ✶sḷt- “sift” (PE14/58).
Neo-Sindarin: I would adapt this verb as ᴺQ. silta- “to sift, sort out, winnow” based on a neo-root ᴺ√SILIT.
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 appearing as ᴱQ. silta “sieve” in the Qenya Lexicon of the 1910s based on the early root ᴱ√SḶTḶ (QL/84). In very light pencil Tolkien add (ṇ) after it, perhaps considering a change in the root.
Neo-Sindarin: I would retain this noun as ᴺQ. silta “sieve” based on a neo-root ᴺ√SILIT.