[ᴱ]^ᴺ√(G)RETH root. “aid, support”
ᴱ√REÞE root. “aid, support”
A root given as ᴱ√RESE “aid, support” (gloss marked with a “?”) in the Qenya Lexicon of the 1910s, but Tolkien later decided that it was confused with another root ᴱ√reðe which seemed to do with kinship (QL/79). After this change, forms derived from ᴱ√RESE “aid” probably still included ᴱQ. resta in the sense “support”, as well as ᴱQ. resta- “aid, come to aid of, rescue, save”. In the contemporaneous Gnomish Lexicon Tolkien has a similar set of words likewise derived from distinct reth- vs. redh- (GL/65), indicating the true form of ᴱ√RESE was probably ᴱ√REÞE, since þ became s in Qenya. As Gnomish derivatives of reth- Tolkien initially gave G. rest¹, G. resta-, G. reth- (GL/65), but these were deleted leaving only G. grest “succour, salvation”, G. gresta- “aid, help, succour, support”, and G. gretha- “save, rescue, preserve” (GL/42).
Neo-Eldarin: For purposes of Neo-Eldarin I think it is worth positing a (Sindarin only) Neo-Root ᴺ√(G)RETH to salvage some of these Gnomish words.
References ✧ GL/65; QL/79