A verb that appeared in both the Outline of Phonetic Development (OP1) of the 1940s and the Outline of Phonology (OP2) of the 1950s, respectively as [ᴹQ.] ñwara- “gnaw, erode, wear away” (OP1: PE19/36) and ñware “frets, wears away” (OP2: PE19/76), in both cases as an example of the development of the initial nasalized-stop ñgw becoming a simple nasal nw.

Conceptual Development: Given the 1930s gloss “gnaw”, Tolkien may have initially felt that this form was related to (and perhaps replaced) ᴹ√NYAD “gnaw” from in The Etymologies of the 1930s (Ety/NYAD). The “gnaw” sense seems to have been abandoned by the 1950s.

Neo-Quenya: I would ignore the 1930s gloss “gnaw”, and just use nwar- for “fret, wear away, erode”. In a post to the Vinyë Lambengolmor Discord Server (VLDS) on 2024-04-21 (https://discord.com/channels/397489292185960468/1090670589640970392/1231636583036489860), Luinyelle and Parmandil suggested it might also be used to mean “worry about” in combination with a reflexive + dative, as in nwaren imne i orcoron “I worry about the orcs, (lit.) I fret myself on the orcs”.