Early Quenya
filume
adjective. gossamer
filumin
adjective. gossamer
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.
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 as filume or filumin “gossamer” in the Qenya Lexicon of the 1910s, noun forms of ᴱQ. filwa or filima “thin, lean” under the early root ᴱ√FILI “fine, thin” (QL/38). The word filume “gossamer” also appeared in the contemporaneous Poetic and Mythological Words of Eldarissa (PME/38).