A verb in the Gnomish Lexicon of the 1910s glossed “smoulder” (GL/36). It was marked with a “✱” which Tolkien used to begin a group of words based on a common root, probably ✱ᴱ√FUKU in this case.
Gnomish
faug
adjective. stinking
faug
noun. wood smoke
fauglas
noun. tobacco
fug-
verb. to smoulder
fuglas
noun. tobacco, *(lit.) smoke leaf
fuglos
noun. tobacco
golog
adjective. stinking
golw
adjective. stinking
luib
adjective. thirsty
luibri
noun. thirst
luist
noun. thirst
maig
adjective. thirst
A word for “wood smoke” in the Gnomish Lexicon of the 1910s (GL/34), probably related to words like G. fug- “smoulder” (GL/36).