Gnomish
fath
noun. tassle
fath
noun. possession, property; rights, legality
fass
noun. tassle
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 noun appearing as G. fath or fass “tassel” in the Gnomish Lexicon of the 1910s, cognate to ᴱQ. fatse (GL/34).
Neo-Sindarin: I’d use the form ᴺS. fass “tassel” for purposes of Neo-Sindarin for better compatibility with the later Quenya form [ᴹQ.] fas (fass-) “fringe”, and I would further assume it was derived from the 1930s root ᴹ√PHAS having to do with shaggy or tangled hair (Ety/PHAS).