Middle Primitive Elvish
raw
root. *roar
rāu
noun. lion
rāmā
noun. wing
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
Tolkien used similar Elvish words for “lion” for much of his life. Lion words were connected to a pair of related roots in the Qenya Lexicon of the 1910s: ᴱ√RAVA or ᴱ√RAẆA (QL/79). The first of these had derivatives like ᴱQ. rauna “prey” and ᴱQ. rauta- “chase, hunt, pursue” as well as ᴱQ. rau “lion”. The second had derivatives like ᴱQ. rauka “swift” and ᴱQ. rawa- “run, chase”. In the contemporaneous Gnomish Lexicon, words like G. raug “rushing, swift” were probably derived from ᴱ√RAẆA and words like G. rau “lion” and G. raust “hunt, chase” were probably derived from ᴱ√RAVA (GL/65).
In The Etymologies of the 1930s Tolkien gave only the root ᴹ√RAW (unglossed) with derivatives like ᴹQ. rá/N. rhaw “lion” (Ety/RAW). Hints of this root are also seen in later words like S. Rauros “Roaring Spray” (RC/327) and Q. rávë “roaring noise” (MC/223), indicating that the root meaning might be “✱roar”. As for “lion”, in the Outline of Phonology of the early 1950s (OP2) Tolkien gave two distinct primitive forms: ✶rāw “lion” and ✶raurō “roarer” (PE19/99, 102, 104).