Early Quenya
ektar
noun. hawthorn, thorn
ektar
noun. swordsman
makillar
noun. swordsman
nehta
noun. hawthorn
tarasse
noun. hawthorn
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.
A word appearing as ᴱQ. ektar “hawthorn” in the Qenya Lexicon and Poetic and Mythological Words of Eldarissa, a combination of ᴱQ. ek- “thorn” and ᴱQ. tar “hedge” (QL/35; PME/35). In the Qenya Lexicon, ektar had the added gloss “thorn”. There was also a longer form ᴱQ. pi(pi)nektar “whitethorn, hawthorn” with prefixed ᴱQ. pi(o)pin “haws [the fruit of hawthorns]” (QL/74; PME/74). Finally there was ᴱQ. tarasse “hawthorn” where ᴱQ. tar was the initial rather than final element (QL/87; PME/87).
Conceptual Development: Tolkien also had ᴱQ. nehta “hawthorn” in Early Qenya Word-lists of the 1920s (PE16/140). Its etymology is unclear, but Wynne and Gilson suggested it might have been extracted from pi(pi)nektar.
Neo-Quenya: I would update this word to ᴺQ. eccahta “hawthorn, (lit.) thorn-hedge” for purposes of Neo-Quenya, using the later word hahta for “hedge”.