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.
rí
noun. reed, grass-stem
liske
noun. reed, reed, [ᴱQ.] sedge
A word mentioned in the Outline of Phonetic Development (OP1) of the 1940s, with the gloss “reed” and derived from primitive ᴹ✶lisge (PE19/51).
Conceptual Development: The word/root ᴱQ. LISKE “sedge, reeds” appeared in the Qenya Lexicon of the 1910s (QL/55). In the contemporaneous Name-list to the Fall of Gondolin, [ᴱQ.] liske was given as a cognate to G. lisg “reed” (PE15/28).
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.
A word appearing in the Declension of Nouns (DN) of the early 1930s glossed “grass-stem, reed” and derived from the root ᴹ√RĪI̯ as an example of a monosyllabic vocalic noun (PE21/38). In drafts of this section it was glossed only “reed” (PE21/41 note #147).