ᴺS. [N.] ^raw² n. “lion” (Category: Lion)
A noun appearing as N. rhaw “lion” in The Etymologies of the 1930s derived from primitive ᴹ✶rāu [rāw] under the root ᴹ√RAW (Ety/RAW), where the initial r was unvoiced to rh as was generally the case in Noldorin. It had a Noldorin plural form of rhui.
Neo-Sindarin: Since the unvoicing of initial liquids did not occur in Sindarin, many people adapt this word as ᴺS. raw “lion” for purposes of Neo-Sindarin, as suggested in Hiswelókë’s Sindarin Dictionary (HSD). Its Sindarin-style plural is more likely to be roe(w) rather than **rui: compare Sindarin plural S. noeg of naug “dwarf” (UT/100) vs. its Noldorin plural N. nuig (EtyAC/NAUK).
References ✧ Ety/RAW
|ON. rō > rhaw||[rǭ] > [rou] > [rau] > [r̥au]||✧ Ety/RAW|
|ON. rōwi > rhui||[rǭwi] > [rouwi] > [rauwi] > [ruiw] > [r̥uiw] > [r̥ui]||✧ Ety/RAW|