@@@ form does not appear elsewhere and similar forms are not relevant
Gnomish
raith
noun. extent, reach; region, sphere, district; scope
beb
adverb. [unglossed]
brid-
verb. [unglossed]
clidhron
noun. [unglossed]
climbol
noun. [unglossed]
dôn
?. [unglossed]
fî
noun. [unglossed]
gatha
?. [unglossed]
pad
noun. [unglossed]
praust
noun. [unglossed]
prog
noun. [unglossed]
rab-
verb. [unglossed]
rô
noun. [unglossed]
sind
noun. [unglossed]
sinthi
pronoun. [unglossed]
thail
noun. [unglossed]
thel
noun. [unglossed]
thelg
noun. [unglossed]
thil
noun. [unglossed]
thion
noun. [unglossed]
thrim
?. [unglossed]
thug
noun. [unglossed]
thû-
verb. [unglossed]
trum
?. [unglossed]
tûn
noun. [unglossed]
ulthanc
noun. [unglossed]
umeg
?. [unglossed]
’ôs
noun. [unglossed]
The noun G. raith appeared in the Gnomish Lexicon of the 1910s, with glosses “extent, reach; region, sphere, district; scope” (GL/65). It was likely based on the early root ᴱ√RAHA “stretch forward” (QL/32, 78). A similar form ᴱN. rhaith appeared in Early Noldorin Word-lists of the 1920s, but without any gloss (PE13/152).
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this noun to ᴺS. raeth, basing it on the later root ᴹ√RAK “stretch out, reach” with the Sindarin phonological result of aeth < aith from the vocalization of ancient akt(h). I would use it only for the senses “extent, reach, scope”, since there are plenty of later attested words for things like “region, sphere, district”.