olvar (sg. #olva) noun "growing things with roots in the earth, *plants" (Silm). Apparently more or less the same word as olwa, olba, which is however glossed "branch". Cf. laima.
Quenya
olva
noun. plant, growing things with roots in the earth
olvar
growing things with roots in the earth, *plants
olba
branch
olba noun "branch" (PM:340; the form *olva may be more frequent; olba can only occur in the Quenya variant that uses lb for lv_. The Etymologies, stem GÓLOB, has _olwa. See also olvar.)
olba
noun. branch
A noun for “branch” in The Shibboleth of Fëanor from 1968 derived from primitive √OLOB (PM/341). It may be a variant of olva “plant”, since lv was sometimes pronounced lb (LotR/1121; PE17/129).
Conceptual Development: The Etymologies of the 1930s had ᴹQ. olwa “branch” derived from primitive ᴹ✶golbā under the root ᴹ√GOLOB (Ety/GÓLOB). The lw in this word seems to be a remnant of Early Qenya phonetic developments, where sometimes lb became lw, the best example being early ᴱQ. elwen vs. Elben “heart” (QL/35; LT2/202). There was a similar word ᴱQ. olwe(n) that was cognate to G. olf(in) “branch, wand, stick” in the Gnomish Lexicon of the 1910s (GL/62), possibly also an example of lb > lw.
olwa
branch
olwa noun "branch" (GÓLOB). Read perhaps *olva in LotR-style Quenya (since the root indicates that lw originates from lb, which in Tolkiens later scheme would rather yield lv, reverting to lb in some forms of late pronunciation; the form olba is attested in PM:340).
olwen
branch, wand, stick
olwen (olwenn-) noun "branch, wand, stick" (LT2:342)
A word for plants appearing only in its plural form olvar “plants” (S/45; NM/270). It may be related to the roots √OLOB “branch” and √OL “grow”, hence “growing thing” as opposed to a celva = “moving thing” (WJ/341). For purposes of Neo-Quenya, I think this word refers mainly to plants as a category of beings (as in the Plant Kingdom), as opposed to an individual plant which would laima.