A noun appearing only it is plural form fui “paths” in the name Fui ’Ngorthrim “Paths of the Dead” (RC/526). The most plausible singular form is ✱fû “path”.
Sindarin
tent
noun. toe
lond
noun. narrow path or strait
lond
noun. entrance to harbour, land-locked haven
lonn
noun. narrow path or strait
lonn
noun. entrance to harbour, land-locked haven
bâd
pathway
fû Speculative
noun. path
imrad
path
(between mountains, hills or through trackless forest) imrad (pass), pl. imraid.
imrad
path
(pass), pl. imraid.
pada
walk
(i bada, i phadar)
râd
path
râd (track), construct rad, pl. raid (idh raidh).
râd
path
(track), construct rad, pl. raid (idh raidh).
(i vâd, construct bad) (beaten track), pl. baid (i maid).