An adjective in the Gnomish Lexicon of the 1910s glossed “clean”, related to the verb G. fas- “wash” (GL/34).
Gnomish
fui
noun. night
fuis
noun. hoard
fuil
feminine name. Queen of the Dark
fuin
adjective. secret, dark; hoarded
fuior
noun. deadly nightshade
fuitha-
verb. to hide (tr.)
fuitha-
verb. to fall (of night); to grow dark
fuithlug
noun. dragon (who guards treasure)
fuin
adverb. worse
fuithlog
noun. dragon (who guards treasure)
fufuin
noun. hoard
fien
adverb. worse
fûn
noun. hoard
cwist
noun. secret
fasc
adjective. clean
fau-
verb. to smell, give off a smell
fech
adjective. bad
fegla
adjective. worse
feigien
adjective. worse
fund
noun. hoard
fêg
adjective. bad, poor, wretched
fô(tha)
noun. hoard
morth
noun. darkness
mugwen
adjective. secret
mô
noun. hand
olch
adjective. bad
ulch
adjective. bad
There were various words for “hoard” in the Gnomish Lexicon of the 1910s, all based on the early root ᴱ√foχo and related to ᴱQ. foa “hoard, treasure” (GL/36; QL/38). Of these, only G. fuis and G. fûn were retained, the latter with a variant fufuin. Tolkien had fû “hoard”, but this was revised to fuis. Tolkien also had {fûl >> fund >>} fûn, and {fûlin or fûlim >>} fûn. On another page he had G. fô or fôtha “a hoard”, but these were revised to G. fô “snow” and G. fôtha “it snows” respectively (GL/35). Before their change in meaning, these last two were connected to (rejected) G. fâ- “have, hold, possess” (GL/33).