ᴺS. [G.] ^fileb n. “fern” (Category: Vegetation (other))
Neo-Sindarin: In Tolkien’s later writing, N. fileg was “small bird”, so I would adapt this Gnomish word as ᴺS. fileb “fern”, assuming a primitive form of *philikwe with kw becoming p (and then b) as usual for Sindarin of the 1950s and 60s. I would also assume that, like N. fileg “small bird”, the singular fileb “fern” was reconstructed based on the plural filib “ferns”.
References ✧ GL/35, 48