*ᴱ√FUVU is a hypothetical root serving as the basis for the word G. fufril “moth” in the Gnomish Lexicon of the 1910s (GL/36). I think it is worth retaining as a Neo-Eldarin root ᴺ√PHUM “moth”, with M instead of V/B to preserve the vowel u in the Neo-Sindarin form.