A Quenya term for “lembas” (Elven waybread) but of different etymological origins appearing in notes from the 1950s, a combination of √KOY “live” and a reduced form of massa or masta “bread” (PM/395, 403-4). As such, its stem form is likely to be either coimass- or coimast-; I prefer the first of these. Tolkien also had Q. lerembas in notes from the 1960s as a more direct cognate of S. lembas (PE17/51).
Neo-Quenya: For purposes of Neo-Quenya I’d stick to coimas, as the etymology of lerembas is rather muddled.
coimas noun "life-bread" = Sindarin lembas(SA:cuivië, PM:395); coimas Eldaron "the coimas of the Eldar" (PM:395)